Section 1
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A golfer drives her golf ball from the tee down the fairway in a high arcing shot. When the ball is at the highest point of its flight: a. the velocity and acceleration are both zero b. the x-velocity is zero and the y-velocity is zero c. the velocity is non-zero and the acceleration is zero d. the x-velocity is non-zero and the y-velocity is zero
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Cards (163)
Section 1
(50 cards)
A golfer drives her golf ball from the tee down the fairway in a high arcing shot. When the ball is at the highest point of its flight: a. the velocity and acceleration are both zero b. the x-velocity is zero and the y-velocity is zero c. the velocity is non-zero and the acceleration is zero d. the x-velocity is non-zero and the y-velocity is zero
D
A projectile is launched from the ground at an angle of 30o. At what point in its trajectory does this projectile have the least speed? a. at the highest point in its flight b. speed is always constant c. just before it hits the ground d. just after it is launched e. halfway between the ground and the highest point
A
For a projectile launched with an initial velocity of 100 m/s, which of the following launch angles, (with respect to the horizontal) will produce the trajectory with the least time in the air? a. 25° b. 45° c. 10° d. 30° e. 70°
10°, C
You drive 4 miles at 30 mi/hr and then another 4 miles at 50 mi/hr. What is your average speed for the whole 8-mile trip? a. equal to 40 mi/hr b. more than 40 mi/hr c. less than 40 mi/hr
less than 40 mi/hr, C
The spring-loaded gun can launch projectiles at different angles with the same launch speed. At what angle should the projectile be launched in order to travel the greatest distance before landing? a. 45° b. 30° c. 75° d. 60° e. 15°
45, A
If each component of a vector is doubled, what happens to the angle of that vector? a. it increases, but by less than double b. it doubles c. it is reduced by half d. it does not change e. it decreases, but not as much as half
D
A ball falls straight down through the air under the influence of gravity. The magnitude of the acceleration a of the ball at any time is equal to 9.8m/s2 that means (assuming down is positive): a. the velocity of the body increases by 9.8 m/s during each second b. the acceleration of the body increases by 9.8 m/s2 during each second. c. the body falls 9.8 m during each second d. the acceleration of the body decreases by 9.8 m/s2 during each second e. the body falls 9.8 m during the first second
A
A river flowing west to east at speed 3 m/min. A man on the south bank of the river , capable of swimming at 6m/min in still water , wants to swim across the river in shortest time. He should swim in a direction: a. Due north b. 60 degrees east of north c. 30 degrees west of north d. 30 degrees east of north
A
The area under a curve in an acceleration versus time graphs gives a. position b. acceleration c. displacement d. velocity
velocity, d
If two vectors are given such that A + B = 0, what can you say about the magnitude and direction of vectors A and B? a. same magnitude, must be in the same direction b. different magnitudes, must be in opposite directions c. different magnitudes, must be in the same direction d. same magnitude, must be in opposite directions e. same magnitude, can be in any direction
D
If the average velocity is non-zero over some time interval, does this mean that the instantaneous velocity is never zero during the same interval? a. it depends b. yes c. no
No, C
A ball is thrown straight upward with some initial speed. When it reaches the top of its flight (at a height h), a second ball is thrown straight upward with the same initial speed. Where will the balls cross paths? a. at height h/2 b. below height h/2 but above 0 c. at height 0 d. at height h e. above height h/2
E, above height h/2
An astronaut on Earth kicks a bowling ball and hurts his foot. A year later, the same astronaut kicks a bowling ball on the Moon with the same force. His foot hurts... a. the same b. more c. less
A
From the same height (and at the same time), one ball is dropped and another ball is fired horizontally. Which ball has the greater velocity at ground level? a. the "dropped" ball b. neither - they both have the same velocity on impact c. it depends on how hard the ball was thrown d. the "fired" ball
D
From the same height (and at the same time), one ball is dropped and another ball is fired horizontally. Which one will hit the ground first? a. they both hit at the same time b. it depends on how hard the ball was fired c. the "dropped" ball d. it depends on the initial height e. the "fired" ball
A
You throw a ball upward with an initial speed of 10 m/s. Assuming that there is no air resistance, what is its speed when it returns to you? a. need more information b. less than 10 m/s c. 10 m/s d. zero e. more than 10 m/s
10 m/s, C
A bullet is fired at an angle of 45°. Neglecting air resistance, what is the direction of acceleration during the flight of the bullet? a. upward b. downward c. at a 45° angle d. dependent on the initial velocity
B
You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As the two rocks continue to fall, what happens to their separation? a. it is impossible to answer without more information b. the separation increases as they fall c. the separation stays constant at 4 m d. the separation decreases as they fall
Seperation increases, B
A small cart is now rolling down an inclined track and accelerating. It fires a ball straight out of the cannon as it moves. After it is fired, what happens to the ball? a. it falls right back into the cart b. it falls in front of the cart c. it falls behind the cart d. it depends upon how much the track is tilted e. it remains at rest
A
You tie a rope to a tree and you pull on the rope with a force of 100 N. What is the tension in the rope? a. 100 N b. 50 N c. 200 N d. 150 N e. 0 N
A
If the position of a car is zero, does its speed have to be zero? a. it depends on the position b. no c. yes
No, B
You're on the street, trying to hit a friend with a water balloon. He sits in his dorm room window above your position. You aim straight at him and shoot. Just when you shoot, he falls out of the window! Does the water balloon hit him?? (Assume that the shot does have enough speed to reach the dorm across the street. ) a. yes, it hits b. no, it misses c. not really sure d. maybe - it depends on the speed of the shot e. the shot is impossible
A
When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion? a. its velocity is constant b. neither its acceleration nor its velocity is constant c. both its acceleration and its velocity are constant d. its acceleration is constant
acceleration is constant, D
You are trying to hit a friend with a water balloon. He is sitting in the window of his dorm room directly across the street. You aim straight at him and shoot. Just when you shoot, he falls out of the window! Does the water balloon hit him? (Assume that the shot does have enough speed to reach the dorm across the street. ) a. yes, it hits b. no, it misses c. maybe - it depends on the speed of the shot d. not really sure e. the shot is impossible
Yes, it hits, A
For a projectile launched with an initial velocity of 100 m/s, which of the following launch angles, (with respect to the horizontal) will produce the trajectory with the longest horizontal range? a. 70° b. 45° c. 10° d. 25° e. 30°
B
A cart is being pulled along a horizontal track by an external force (a weight hanging over the table edge) and accelerating. It fires a ball straight up out of the cannon as it moves. After it is fired, what happens to the ball? a. it falls behind the cart b. it falls in front of the cart c. it falls right back into the cart d. it remains at rest e. it depends upon how much the track is tilted
A
Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, What would have to be done in order to have the cart continue with constant acceleration? a. push the cart continuously b. push the cart harder before release c. it is impossible to do that d. change the mass of the cart e. push the cart longer before release
A
If the velocity of a car is non-zero, can the acceleration of the car be zero? a. it depends on velocity b. no c. yes
yes, C
You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude that you can obtain out of the following choices? a. 0 b. 37 c. 18 d. 64 e. 100
B
You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As the two rocks continue to fall, what happens to their velocities? a. both increase at the same rate b. both velocities stay constant c. the velocity of the second rock increases faster than the velocity of the first d. the velocity of the first rock increases faster than the velocity of the second
Both increase at same rate, A
A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball? a. it depends on how fast the cart is moving b. it falls right back into the cart c. it remains at rest d. it falls in front of the cart e. it falls behind the cart
B
In which of the following situations would an object be accelerated? I. It moves in a straight line at constant speed. II. It moves with uniform circular motion. III. It travels as a projectile in a gravitational field with negligible air resistance. a. I and II only b. I, II, and III c. II and III only d. I only e. III only
C
A block rests at the edge of a platform that is 10 meters above level ground. Air resistance is negligible. The time it will take for the block to reach the ground is most nearly a. 1.4 s b. 2.0 s c. 0.3 s d. 3.0 s e. 1.0 s
1.4 s, A
The slope of a position versus time graph gives a. displacement b. velocity c. position d. acceleration
velocity, B
Does the odometer in a car measure distance or displacement? a. displacement b. distance c. both
distance, B
Does the speedometer in a car measure velocity or speed? a. speed b. velocity c. neither d. both
speed, A
A rocket is fired at 30°. If the initial horizontal velocity (vix) is 326 m/s, what is the initial vertical velocity (viy)? a. 250 m/s b. 188 m/s c. 380 m/s d. 330 m/s
B
You're on the street, trying to hit a friend with a water balloon. He sits in his dorm room window above your position and is aiming at you with HIS water balloon! You aim straight at him and shoot and he does the same in the same instant. Do the water balloons hit each other? a. the shots are impossible b. not really sure c. yes, they hit d. maybe - it depends on the speeds of the shots e. no, they miss
C
You drive for 30 minutes at 30 mi/hr and then for another 30 minutes at 50 mi/hr. What is your average speed for the whole trip? a. less than 40 mi/hr b. more than 40 mi/hr c. equal to 40 mi/hr
equal to 40 mi/hr, C
Two tug-of-war opponents each pull with a force of 100 N on opposite ends of a rope. What is the tension in the rope? a. 150 N b. 200 N c. 0 N d. 50 N e. 100 N
E
A soccer ball is kicked at a 55° angle with an initial velocity of 8 m/s. What is the vertical (vyf) velocity of the ball as it hits the ground? a. cannot be determined from given information b. -6.6 m/s c. -8 m/s d. 8 m/s
-6.6 m/s, B
You throw a ball straight up into the air. After it leaves your hand, at what point in its flight does it have the maximum value of acceleration? a. just before it returns to your hand on the way down b. halfway to the top of its trajectory c. its acceleration is constant everywhere d. at the top of its trajectory e. just after it leaves your hand
C
An object is released from rest on a planet that has no atmosphere. The object falls freely for 3.0 meters in the first second. What is the magnitude of the acceleration due to gravity on the planet? a. 3.0 m/s2 b. 6.0 m/s2 c. 1.5 m/s2 d. 12.0 m/s2 e. 10.0 m/s2
6.0 m/s2, B
A certain vector has x and y components that are equal in magnitude. Which of the following is a possible angle for this vector, in a standard x-y coordinate system? a. 180° b. 90° c. 45° d. 60° e. 30°
C
Does the displacement of an object depend on the specific location of the origin of the coordinate system? a. no b. yes c. it depends on the coordinate system
No, A
Given that A + B = C, and that lAl 2 + lBl 2 = lCl 2, how are vectors A and B oriented with respect to each other? a. they are perpendicular to each other b. they are at 45° to each other c. they are parallel but in the opposite direction d. they can be at any angle to each other e. they are parallel and in the same direction
A
Given that A + B = C, and that lAl + lBl = lCl, how are vectors A and B oriented with respect to each other? a. they can be at any angle to each other b. they are parallel and in the same direction c. they are at 45° to each other d. they are perpendicular to each other e. they are parallel but in the opposite direction
B
You and your dog go for a walk to the park. On the way, your dog takes many side trips to chase squirrels or examine fire hydrants. When you arrive at the park, do you and your dog have the same displacement? a. no b. yes c. not enough information
Yes, B
When throwing a ball straight up, which of the following is true about its velocity v and its acceleration a at the highest point in its path? a. both v not 0 and a not 0 b. v = 0, but a not 0 c. v not 0, but a = 0 d. both v = 0 and a = 0 e. not really sure
V=0, but no a not 0, B
You drop a package from a plane flying at constant speed in a straight line. Without air resistance, the package will: a. not fall at all b. move ahead of the plane while falling c. quickly lag behind the plane while falling d. remain vertically under the plane while falling
D
Section 2
(50 cards)
A hockey puck slides on ice at constant velocity. What is the net force acting on the puck? a. zero b. depends on the speed of the puck c. less than its weight but more than zero d. equal to its weight e. more than its weight depends on the speed of the puck
A
Compared to its mass on the Earth, the mass of an object on the Moon is a. more b. less c. half as much d. the same
D
The area under the curve, on a Force versus position (F vs. x) graph, represents a. power. b. kinetic energy. c. potential energy. d. work
D
The gravitational force between two objects is inversely proportional to a. the product of the two objects. b. the square of the product of the two objects. c. the distance between the two objects. d. the square of the distance between the two objects.
D
Tom carries a 54 kg box up the stairs and gains 50 meters of altitude in exactly 240 seconds. His friend, Mary, carries a 30 kg box up the same stairs in 127 seconds. Who does more work on his/her box? a. Mary b. Tom c. Their work is the same
B
The Moon does not crash into Earth because: a. it's in Earth's gravitational field b. the net force on it is zero c. it is beyond the main pull of Earth's gravity d. it's being pulled by the Sun as well as by Earth e. none of the above
E
A 12,000 W crane motor can lift a block to a height of 52 meters in a period of 15 seconds. What is the mass of the block? a. 3.4 kg b. 10 kg c. 3462 kg d. 346 kg e. 4160 kg
D
The speed of Halley's Comet, while traveling in its elliptical orbit around the Sun, a. decreases as it nears the Sun b. is constant c. increases as it nears the Sun d. is zero at two points in the orbit
C
Tom carries a 54 kg box up the stairs and gains 50 meters of altitude in exactly 240 seconds. His friend, Mary, carries a 30 kg box up the same stairs in 127 seconds. Who has the largest power, Tom or Mary? a. Tom b. Their power is the same c. Mary
C
A force F acts on mass M for a time interval T, giving it a final speed v. If the same force acts for the same time on a different mass 2M, what would be the final speed of the bigger mass? a. 2 v b. 4 v c. 1/4 v d. v e. 1/2 v
E
You kick a smooth flat stone out on a frozen pond. The stone slides, slows down and eventually stops. You conclude that: a. a net force acted on it all along b. no net force acted on the stone c. the stone has a natural tendency to be at rest d. the stone simply "ran out of steam" e. the force pushing the stone forward finally stopped pushing on it
A
A block slides from rest down a frictionless slide gaining 60 J of kinetic energy when it reaches the bottom. The potential energy of the block when it is ½ way down the slide is: a. 20 J b. 40 J c. 60 J d. 0 J e. 30 J
E
If the distance to the Moon were tripled, then the force of attraction between Earth and the Moon would be: a. 1/6 b. 1/9 c. Tripled d. 6 times as much e. 1/3
B
A car starts from rest and accelerates to 30 mph. Later, it gets on a highway and accelerates to 60 mph. Which takes more energy, the 0 to 30 mph, or the 30 to 60 mph? a. 0 to 30 b. both the same c. 30 to 60
C
When you climb up a rope, the first thing you do is pull down on the rope. How do you manage to go up the rope by doing that?? a. you're not really pulling down - it just seems that way b. this slows your initial velocity which is already upward c. you don't go up, you're too heavy d. you are pulling the ceiling down e. the rope actually pulls you up
E
A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose? a. more than 30 J b. less than 30 J c. cannot be determined from the information given d. exactly 30 J
A
Antilock brakes keep the car wheels from locking and skidding during a sudden stop. Why does this help slow the car down? a. none of the above b. µs > µk so static friction is better c. µs > µk so sliding friction is better d. µk > µs so static friction is better e. µk > µs so sliding friction is better
B
An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors. a. The vectors are perpendicular b. Both vectors point in the same direction. c. The question is meaningless, since the acceleration is zero. d. The vectors point in opposite directions.
A
If Spacecraft X has twice the mass of Spacecraft Y. then true statements about X and Y include which of the following? I. On Earth, X experiences twice the gravitational force that Y experiences. II. On the Moon, X has twice the weight of Y. III. When both are in the same circular orbit, X has twice the centripetal acceleration of Y. a. I and II only b. II and III on1y c. I, II, and III d. I only e. III only
A
A box sits in a pickup truck on a frictionless truck bed. When the truck accelerates forward, the box slides off the back of the truck because: a. the force from the rushing air pushed it off b. the force of friction pushed it off c. none of the above d. no net force acted on the box e. truck went into reverse by accident
D
A very large truck sits on a frozen lake. Assume there is no friction between the tires and the ice. A fly suddenly smashes against the front window. What will happen to the truck? a. it accelerates forward b. it moves forward at const. speed c. it accelerates backward d. it is too heavy, so it just sits there e. it moves backward at const. speed
A
If you push twice as hard against a stationary brick wall, the amount of work you do a. remains constant but non-zero. b. doubles. c. remains constant at zero. d. is cut in half.
C
Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, what will happen to the cart? a. immediately come to a stop b. continue with constant acceleration c. continue with decreasing acceleration d. slowly come to a stop e. continue with constant velocity
E
Who was the first person to realize that the planets move in elliptical paths around the Sun? a. Kepler b. Newton c. Einstein d. Galileo
A
In which of the following situations would an object be accelerated? I. It moves in a straight line at constant speed. II. It moves with uniform circular motion. III. It travels as a projectile in a gravitational field with negligible air resistance. a. I and II only b. III only c. I only d. II and III only e. I, II, and III
D
How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm? a. 8 times the work b. 4 times the work c. same amount of work d. twice the work
B
You and a friend can each pull with a force of 20 N. If you want to rip a rope in half, what is the best way? a. get a large dog to bite the rope b. tie the rope to a tree, and you both pull from the same end c. you and your friend each pull on opposite ends of the rope d. it doesn't matter -- both of the above are equivalent
B
A spaceship is traveling to the Moon. At what point is it beyond the pull of Earth's gravity? a. when it gets above the atmosphere b. when it is closer to the Moon than it is to Earth c. It is never beyond the pull of Earth's gravity. d. when it is half-way there
C
Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration? a. Yes, this is possible if the speed is constant. b. No, because then the path would not be a circle. c. Yes, this is possible if the speed is changing. d. No, an object can only have one or the other at any given time.
C
What type of acceleration does an object moving with constant speed in a circular path experience? a. free fall b. linear acceleration c. centripetal acceleration d. constant acceleration
C
A car goes around a curve of radius r at a constant speed v. Then it goes around the same curve at half of the original speed. What is the centripetal force on the car as it goes around the curve for the second time, compared to the first time? a. twice as big b. half as big c. one-fourth as big d. four times as big
C
Compared to yesterday, you did 3 times the work in one-third the time. To do so, your power output must have been a. 9 times yesterday's power output. b. one-third of yesterday's power output. c. the same as yesterday's power output. d. 3 times yesterday's power output.
A
An object has a weight W when it is on the surface of a planet of radius R. What will be the gravitational force on the object after it has been moved to a distance of 4R from the center of the planet? a. 4 W b. W c. 1/16 W d. 1/4 W e. 16 W
C
A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the car? a. The truck has twice the kinetic energy of the car. b. The truck has 8 times the kinetic energy of the car. c. The truck has 4 times the kinetic energy of the car. d. All that can be said is that the truck has more kinetic energy.
B
Two stones, one twice the mass of the other, are dropped from a cliff. Just before hitting the ground, what is the kinetic energy of the heavy stone compared to the light one? a. the same b. twice as much c. four times as much d. quarter as much e. half as much
B
The maximum potential energy of a pendulum with a length of 2 meters is 20 J. When it swings to the bottom of its arc its kinetic energy is: a. 0 J b. 20 J c. 10 J d. 40 J e. 30 J
B
If you walk 5.0 m horizontally forward at a constant velocity carrying a 10-N object, the amount of work you do on the 1kg object is: a. zero. b. equal to 50 J. c. less than 50 J, but more than 0 J. d. more than 50 J.
A
Two Satellites A and B of the same mass are going around Earth in concentric orbits. The distance of satellite B from Earth's center is twice that of satellite A. What is the ratio of the centripetal force acting on B compared to that acting on A? a. 1/4 b. 1/2 c. 2 d. 1/8 e. it's the same
A
A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point? a. g downward b. 0.5g downward c. 2g upward d. g upward
A
Is it possible for an object moving with a constant speed to accelerate? a. No, if the speed is constant then the acceleration is equal to zero. b. Yes, if an object is moving it can experience acceleration c. Yes, although the speed is constant, the direction of the velocity can be changing. d. No, an object can accelerate only if there is a net force acting on it.
C
A rock has 12 J of potential energy when it is 20 meters above the reference point of the ground. If it is raised to 40 meters above the ground,how much potential energy would it now have? a. 3 J b. 6 J c. 24 J d. 100 J e. 0 J
C
You drive your dad's car too fast around a curve and the car starts to skid. What is the correct description of this situation? a. friction between tires and road is not strong enough to keep car in a circle b. a deer caused you to skid c. car's engine is not strong enough to keep the car from being pushed out d. car is too heavy to make the turn e. none of these are correct
A
If a car traveling 60 km/hr can brake to a stop within 20 m, what is its stopping distance if it is traveling 120 km/hr? Assume that the braking force is the same in both cases. a. 30 m b. 20 m c. 40 m d. 60 m e. 80 m
E
A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension? a. tension does negative work b. tension does no work at all c. tension does positive work
B
You put your book on the bus seat next to you. When the bus stops suddenly, the book slides forward off the seat. Why? a. a net force acted on it b. it did not move, but only seemed to c. it remained at rest d. gravity briefly stopped acting on it e. no net force acted on it
E
A hypothetical planet has a mass of half that of the Earth and a radius of twice that of the Earth. What is the acceleration due to gravity on the planet in terms of g, the acceleration due to gravity at the Earth? a. g/2 b. g c. g/4 d. g/8
D
A car initially travels north and then turns to the left along a circular curve. This causes a package on the seat of the car to slide toward the right side of the car. Which of the following is true of the net force on the package while it is sliding? a. The force is directed away from the center of the circle. b. The force is directed north. c. There is not enough force tangential to the car's path to keep the package from sliding. d. There is not enough force directed north to keep the package from sliding. e. There is not enough force directed toward the center of the circle to keep the package from sliding.
E
A planet of constant mass orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energy? a. It remains constant. b. It increases continually. c. It decreases continually. d. It increases when the planet approaches the Sun, and decreases when it moves farther away.
D
A toy car has 9000 J of kinetic energy when its velocity across a horizontal floor is 6 miles per hour. How much kinetic energy would the car have if its velocity is decreased to 2 miles per hour? a. 4500 J b. 3000 J c. 1000 J d. 81,000 J e. 27,000 J
B
Does the centripetal force acting on an object do work on the object? a. Yes, since a force acts and the object moves, and work is force times distance. b. Yes, since it takes energy to turn an object. c. No, because the object has constant speed. d. No, because the force and the displacement of the object are perpendicular.
D
Section 3
(50 cards)
A weight lifter holds a 40 kg mass at a constant height of 1.5 meters above the ground for 6 seconds. The work done by the weight lifter during those 6 seconds is: a. 0 J b. 100 J c. 10 J d. 60 J e. 600 J
A
You are lying in bed and you want to shut your bedroom door. You have a superball and a blob of clay (both with the same mass) sitting next to you. Which one would be more effective to throw at your door to close it? a. you are just too lazy to throw anything b. the superball c. it doesn't matter -- they are equally effective d. the blob of clay
B
When a golf club hits a golf ball, the change in momentum of the ball is _______the change in momentum of the club. a. greater than b. equal to c. less than
D
A person stands under an umbrella during a rainstorm. Later the rain turns to hail, although the number of "drops" hitting the umbrella per time and their speed remains the same. Which case requires more force to hold the umbrella? a. when it is raining b. when it is hailing c. same in both cases
B
A uranium nucleus (at rest) undergoes fission and splits into two fragments, one heavy and the other light. Which fragment has the greater momentum? a. impossible to say b. both have the same momentum c. the heavy one d. the light one
B
A mass is suspended from the ceiling of an elevator by a spring. When the elevator is at rest, the period is T. What happens to the period when the elevator is moving upward at constant speed? a. period will not change b. period will increase c. period will decrease
A
A 50 kg skater is traveling at 10 m/s to the right. A second skater of mass 50 kg collides inelastically with our first 50 kg skater. What velocity must the second skater have in order to cause both skaters to come to a complete stop? a. 5 m/s to the left b. 15 m/s to the left c. 7.5 m/s to the left d. 10 m/s to the left e. 7.5 m/s to the right
D
A box slides with initial velocity 10 m/s on a frictionless surface and collides inelastically with an identical box. The boxes stick together after the collision. What is the final velocity? a. 15 m/s b. 0 m/s c. 20 m/s d. 5 m/s e. 10 m/s
D
A pendulum is suspended from the ceiling of an elevator. When the elevator is at rest, the period is T. What happens to the period when the elevator is accelerating upward? a. period increases b. period decreases c. period will not change
B
Compared to landing with bent knees, if you jump off a desk and land with your knees locked, it hurts more because: a. the time to stop is greater b. the impulse is greater c. the force experienced to stop is greater d. the change in momentum is more e. the change in velocity is greater
C
A mass on a spring in SHM has amplitude A and period T. What is the total distance traveled by the mass after a time interval T? a. 0 b. 4A c. A d. A/2 e. 2A
B
You are walking out on a frozen lake and you begin to hear the ice cracking beneath you. What is your best strategy for getting off the ice safely? a. shuffle your feet (without lifting them) to move towards shore b. stand absolutely still and don't move a muscle c. lie down flat on the ice and crawl toward shore d. try to leap in one bound to the bank of the lake e. jump up and down to lessen your contact time with the ice
C
The padding on a car's dashboard _______ the time of a passenger's impact during a collision, which decreases the resulting force. a. lengthens b. has no effect on the amount of c. shortens
A
Units of power include which of the following? I. Watt II. Joule per second III. Kilowatt‑hour a. I only b. II and III only c. I, II, and III d. I and II only e. III only
D
A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change? a. the ball b. cannot be determined from the information given c. Both experience the same momentum change. d. the putty
A
If both the force that acts on an object and the time of impact are doubled, by how much is the impulse changed? a. the impulse is halved b. the impulse remains the same c. the impulse is doubled d. the impulse is quadrupled e. the impulse is one-fourth of original
D
When a bullet is fired from a gun, the bullet and the gun have equal and opposite momenta. If this is true, then why is the bullet deadly? (whereas it is safe to hold the gun while it is fired) a. it is much sharper than the gun b. it goes a longer distance and gains speed c. it has more momentum than the gun d. it is smaller and can penetrate your body e. it has more kinetic energy than the gun
E
Amy (150 lbs) and Gwen (50 lbs) are standing on slippery ice and push off each other. If Amy slides at 6 m/s, what speed does Gwen have? a. 2 m/s b. 18 m/s c. 9 m/s d. 6 m/s e. 12 m/s
B
A swinging pendulum has period T on Earth. If the same pendulum were moved to the Moon, how does the new period compare to the old period? a. period will not change b. period will decrese c. period will increase
C
Two pendula have different lengths: one has length L and the other has length 4L. How do their periods compare? a. period of 4L is four times that of L b. period of 4L is one-half that of L c. period of 4L is two times that of L d. period of 4L is the same as that of L e. period of 4L is one-quarter that of L
C
Two pendula have the same length, but different masses attached to the string. How do their periods compare? a. period is greater for the greater mass b. period is the same for both cases c. period is greater for the smaller mass
B
You tee up a golf ball and drive it down the fairway. Assume that the collision of the golf club and ball is elastic. When the ball leaves the tee, how does its speed compare to the speed of the golf club? a. less than b. greater than c. equal to
B
By what factor does the kinetic energy of a car change when its speed is tripled? a. factor of 9 b. factor of 3 c. factor of 6 d. no change at all e. factor of 12
A
A small car and a large truck collide head-on and stick together. Which one has the larger momentum change? a. can't tell without knowing the final velocities b. they both have the same momentum change c. the car d. the truck
B
A fence pushes with a force of 373 N stopping a runaway bicycle, mass 75.0-kg, in 7.01 sec. find the impulse the fence puts on the bicycle in N·s. a. 5150 b. 53.2 c. 196000 d. 2610
D
A spring loaded gun fires a medium-sized projectile to the right. a. the magnitude of the impulse experienced by projectile will be smaller than the impulse experienced by the gun b. the total momentum of them system after the explosion will equal zero c. the magnitude of the impulse experienced by the projectile will be greater than the impulse experience by the gun d. the velocity of the gun will equal the velocity of the projectile e. none of these are true
B
Torque a. is the vector product of displacement and force. b. must always equal zero. c. is always greater for shorter lever arms. d. is a scalar and has no direction associated with it. e. is always equal to force.
A
A mass oscillates on a vertical spring with period T. If the whole setup is taken to the Moon, how does the period change? a. period will decrease b. period will increase c. period will not change
C
If a space ship were motionless in the near vacuum of space and it blasted its rockets a. would move in the opposite direction as the rocket exhaust b. would move in the same direction as the rocket exhaust c. the ship would remain stationary because there is nothing to push against
A
A ball is thrown against a wall, bounces back at the same speed, and is caught by the thrower. Which one of the following is true: a. the impulse of the bounce is the greatest b. the impulse during the catch is the greatest c. the impulse during the throw is the greatest d. all three impulses are equal
A
If you pitch a baseball with twice the kinetic energy you gave it in the previous pitch, the magnitude of its momentum is a. 4 times as much. b. doubled. c. 1.41 times as much. d. the same.
B
A sledder is coasting on a frictionless surface and passes by a waiting friend. The friend hops on to the sled as it goes by. The mass of the two riders and sled together is twice that of the first rider and sled alone. a. the momentum of the system (2 riders & sled) will halve b. the velocity of the sled and two riders will be half of the original velocity c. A) the momentum of the system (2 riders & sled) will double d. the velocity of the sled and two riders will be twice the original velocity
B
An aluminum cylinder and a pail together weigh 29 N, as read on a scale. With the cylinder submerged, the scale reads 20 N. If the displaced water is poured into the pail, what will the scale read? a. 29 N b. less than 20 N c. greater than 29 N d. 20 N e. between 20 N and 29 N
A
Where is center of mass of a baseball bat located? a. it depends on how heavy the bat is b. closer to the thin end (near handle) c. closer to the thick end d. at the midpoint
C
In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is a. completely inelastic. b. any of the choices, depending on the mass of the balls. c. elastic. d. inelastic.
C
You drive around a curve in a narrow one-way street at 30 mph when you see an identical car heading straight toward you at 30 mph. You have two options: hit the car head-on or swerve into a massive concrete wall (also head-on). What should you do? a. get insurance! b. hit the other car c. hit the wall d. call your physics teacher! e. makes no difference
E
A small beanbag and a bouncy rubber ball are dropped from the same height above the floor. They both have the same mass. Which one will impart the greater impulse to the floor when it hits a. the rubber ball b. both the same c. the bean bag
A
Suppose that the speedometer of a truck is set to read the linear speed of the truck, but uses a device that actually measures the angular speed of the tires. If larger diameter tires are mounted on the truck instead, how will that affect the speedometer reading as compared to the true linear speed of the truck? a. speedometer reads a lower speed than the true linear speed b. speedometer still reads the true linear speed c. speedometer reads a higher speed than the true linear speed
A
Which has a greater momentum a rolling skateboard or a semi-truck at rest? a. the skateboard b. not enough info c. the truck d. neither, they are the same
A
Two forces produce the same torque. Does it follow that they have the same magnitude? a. Yes b. No c. Depends
B
Two boxes, one heavier than the other, are initially at rest on a horizontal frictionless surface. The same constant force F acts on each one for exactly 1 second. Which box has more momentum after the force acts? a. the heavier one b. the lighter one c. both the same
C
A small beanbag and a bouncy rubber ball are dropped from the same height above the floor. They both have the same mass. Which one will impart the greater impulse to the floor when it hits? a. the beanbag b. the rubber ball c. both the same
B
After a pendulum starts swinging, its amplitude gradually decreases with time because of friction. What happens to the period of the pendulum during this time? a. period decreases b. period increases c. period does not change
C
Two equal-mass particles (A and B) are located at some distance from each other. Particle A is held stationary while B is moved away at speed v. What happens to the center of mass of the two-particle system? a. it moves away from A with speed v b. it moves away from A with speed 1/2 v c. it moves toward A with speed v d. it moves toward A with speed 1/2 v e. it does not move
B
A heavy object strikes a lighter object at rest. Mark all of the following which are true: a. the lighter object strikes the heavy object with a greater force b. the heavy object has an equal and opposite change in momentum as the lighter object c. the heavy object strikes the lighter object with an equal but opposite force d. the heavy object strikes the lighter object with a greater force e. the heavy object has a greater change in momentum than the lighter object
B,C
A pendulum is suspended from the ceiling of an elevator. When the elevator is at rest, the period is T. What happens to the period when the elevator is moving upward at constant speed? a. period will not change b. period will increase c. period will decrease
A
Consider two elastic collisions: 1) a golf ball with speed v hits a stationary bowling ball head-on. 2) a bowling ball with speed v hits a stationary golf ball head-on. In which case does the golf ball have the greater speed after the collision? a. situation 2 b. situation 1 c. same for both
A
If the amplitude of a simple harmonic oscillator is doubled, which of the following quantities will change the most? a. maximum acceleration b. period c. frequency d. total mechanical energy e. maximum speed
D
A glider with a spring attached to each end oscillates with a certain period. If the mass of the glider is doubled, what will happen to the period? a. period will decrease b. period will not change c. period will increase
C
A bowling ball and a ping-pong ball are rolling toward you with the same momentum. If you exert the same force to stop each one, which takes a longer time to bring to rest? a. the ping-pong ball b. impossible to say c. the bowling ball d. same time for both
D
Section 4
(13 cards)