Section 1
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The quantity 2.67 × 103 m/s has how many significant figures?
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Cards (60)
Section 1
(50 cards)
The quantity 2.67 × 103 m/s has how many significant figures?
3
If an object is speeding up, __________. 1. its acceleration can be positive or negative depending on the direction of motion 2. its acceleration is positive 3. its acceleration is negative
1. its acceleration can be positive or negative depending on the direction of motion
For uniform circular motion, the acceleration __________. 1. is always due to gravity 2. is parallel to the velocity 3. is larger for a larger orbit at the same speed 4. is directed toward the center of the circle
4. is directed toward the center of the circle
The video showed two clips of a cyclist moving along a stretch of pavement. In each clip,
The cyclist had periods of changing speed as well as periods of uniform motion.
Velocity vectors point __________.
in the same direction as displacement vectors
The slope at a point on a position-versus-time graph of an object is the __________.
object's instantaneous velocity at that point
If Sam walks 100 m to the right, then 200 m to the left, his net displacement vector __________.
points to the left
You toss a basketball toward the basket. At the highest point of its arc, 1. The vertical component of the velocity is zero. 2. The horizontal component of the velocity is zero. 3. Both the horizontal and vertical components of the velocity are zero.
1. The vertical component of the velocity is zero.
The names for the two types of friction discussed in the video are 1. Rolling friction and kinetic friction. 2.Static friction and sliding friction. 3. Kinetic friction and potential friction. 4. Static friction and kinetic friction. 5. Dynamic friction and static.
4. static friction and kinetic friction
The drag force pushes opposite your motion as you ride a bicycle. If you double your speed, what happens to the magnitude of the drag force? 1. The drag force increases. 2. The drag force decreases. 3. The drag force stays the same.
1. the drag force increases
What is the difference between speed and velocity?
Velocity contains information about the direction of motion while speed does not.
In the video, we looked at the problem of balancing a pencil on your fingertip, which is easy for a long pencil, hard for a short pencil. If you consider a long and a short pencil tipped to the side, the __________ of the shorter pencil is larger. 1. Moment of inertia 2. Angular acceleration 3. Center of mass 4. Torque
2. angular acceleration
In the video, the two stuffed animals that rode on the turntable had the same __________ but had different __________. 1. Angular velocity, velocity 2. Velocity, angular velocity 3. Velocity, acceleration 4. Acceleration, velocity
1. Angular velocity, velocity
How many times per day does the International Space Station—or any satellite in a similar low orbit—go around the earth? 1 3 5 15
15
The acceleration that an object experiences is 1. Inversely proportional to the net force, proportional to the mass. 2. Inversely proportional to the net force, inversely proportional to the mass. 3. Proportional to the net force, proportional to the mass. 4. Proportional to the net force, inversely proportional to the mass.
4. Proportional to the net force, inversely proportional to the mass.
In general, the coefficient of static friction is __________. 1. smaller than the coefficient of kinetic friction 2. equal to the coefficient of kinetic friction 3. greater than the coefficient of kinetic friction
3. greater than the coefficient of kinetic friction
The acceleration vector of a particle in uniform circular motion __________. 1. is zero 2. points toward the center of the circle 3. points tangent to the circle, in the direction of motion 4. points tangent to the circle, opposite the direction of motion
2. points toward the center of the circle
A 1-pound ball and a 100-pound ball are dropped from a height of 10 feet at the same time. In the absence of air resistance, __________. 1. the 1-pound ball wins the race 2.There's not enough information to determine which ball wins the race. 3. the 100-pound ball wins the race 4. the two balls end in a tie
4. the two balls end in a tie
The correct SI units for distance and mass are _____ and _____.
meters / kilograms
If you experience weightlessness, this means that 1. There is no net force acting on you. 2. You are accelerating upward. 3. Your apparent weight is zero. 4. There is no gravity acting on you.
3. your apparent weight is zero
You are riding in an elevator that is accelerating upward. Suppose you stand on a scale. The reading on the scale is __________. 1. greater than your true weight 2. less than your true weight 3. equal to your true weight
1. greater than your true weight
An object in circular motion has velocity that is constantly changing. The direction of the acceleration is 1. Parallel to the motion, along the circle. 2. Away from the center of the circle. 3. Toward the center of the circle.
3. toward the center of the circle
If you are standing on the floor, motionless, what are the forces that act on you? 1. weight force and normal force 2. normal force and friction force 3. weight force
1. weight force and normal force
Which of these is NOT a force discussed in this chapter? 1. the thrust force 2. the normal force 3. the orthogonal force 4. the tension force
3. the orthogonal force
In the video, a car rounding a corner and a car going over the crest of a hill are both presented as examples of 1. Uniform circular motion. 2. Apparent weight making passengers "feel heavy." 3. Acceleration produced by a net force parallel to the velocity. 4. Acceleration produced by friction forces.
1. uniform circular motion
Consider two graphs of velocity versus time for two objects in free fall. What can we say about the graphs? A. The two graphs have the same slope. B. The two graphs are both straight lines. C. both are true
both are true
The two different types of equilibrium discussed in the video are 1. Static equilibrium and dynamic equilibrium 2. Potential equilibrium and kinetic equilibrium 3. Dynamic equilibrium and kinematic equilibrium 4. Kinetic equilibrium and static equilibrium
1. Static equilibrium and dynamic equilibrium
Which of the following is an example of uniform motion 1. A person at rest starts running in a straight line in a fixed direction 2. A car going around a circular track at a constant speed 3. A ball dropped from the top of a building 4. A hockey puck sliding in a straight line at a constant speed
4. A hockey puck sliding in a straight line at a constant speed
For an object in uniform circular motion, what can you say about the directions of the velocity, acceleration, and net force vectors? 1. The velocity vector is perpendicular to the acceleration vector; the acceleration vector is perpendicular to the net force vector. 2. The velocity vector is perpendicular to the acceleration vector; the acceleration vector is parallel to the net force vector. 3. The velocity vector is parallel to the acceleration vector; the acceleration vector is parallel to the net force vector. 4. The velocity vector is parallel to the acceleration vector; the acceleration vector is perpendicular to the net force vector.
2. The velocity vector is perpendicular to the acceleration vector; the acceleration vector is parallel to the net force vector.
Newton's law of gravity describes the gravitational force between __________. 1. All of the listed answers are correct. 2. Earth and the moon. 3. a person and the earth. 4. Earth and the sun. 5. the sun and the planets.
1. All of the listed answers are correct.
Which of these objects is in equilibrium? 1. A car driving down the road at a constant speed. 2. A skydiver falling at a constant speed. 3. A block sitting at rest on a table. 4. All of the listed answers are correct.
4. all of the listed answers are correct
If you throw a ball against the ceiling—so the ball moves upward and then rebounds to move downward—at the instant the ball hits the ceiling, the acceleration is
negative
The acceleration of a cart rolling down a ramp depends on __________. 1. both the angle of the ramp and the length of the ramp 2. neither the angle of the ramp or the length of the ramp 3. the angle of the ramp 4. the length of the ramp
3. the angle of the ramp
For the block sliding on the table in the video, the force of kinetic friction was __________ the maximum value of the static friction force; this is generally true. 1. Smaller than 2. The same as 3. Larger than
1. smaller than
A skydiver has reached terminal velocity—she now falls at a constant speed, so her acceleration is zero. Is there a net force on her? If so, what is the direction? 1. There is no net force. 2. There is a net force directed upward. 3. There is a net force directed downward.
1. there is no net force
The ______ of a vector is always a positive quantity. 1. magnitude 2.direction 3. X-component 4. Y-component
1. magnitude
If you stand on a trampoline, it depresses under your weight. When you stand on a hard stone floor, __________. 1. the floor deforms a slight amount if you are heavy enough 2. the floor does not deform under your weight; it is too stiff 3. the floor deforms—very slightly—under your weight
3. the floor deforms—very slightly—under your weight
The area under a velocity-versus-time graph of an object is __________.
the displacement of the object
if an object is in uniform motion, the dots on motion diagrams
evenly spaced
When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1. friction 2. tension 3. gravity 4. normal force 5. air resistance
1. friction
Two boxes are suspended from a rope over a pulley. Each box has weight 50 N. What is the tension in the rope? 1. 25 N 2. 50 N 3. 100 N
2. 50 N
Astronauts on the International Space Station feel weightless because 1. They are far enough above the earth's surface that the gravitational force is negligible. 2. They are above the earth's atmosphere. 3. Their apparent weight is zero. 4. The gravity of the earth and the sun are directed opposite each other, so there is no net gravitational force.
3. Their apparent weight is zero.
An action/reaction pair of forces ____________. 1. points in the same direction. 2. acts on the same object. 3. acts on two different objects. 4. are always long-range forces.
3. acts on two different objects
The slope at a point on a position-versus-time graph of an object is
the object's instantaneous velocity at that point
If you are not wearing a seat belt and the car you are driving hits a fixed barrier, you will hit the steering wheel with some force. This is because __________. 1. the force of the collision has thrown you forward 2. the steering wheel has been pushed back toward you 3. you continue moving even after the car has stopped
3. you continue moving even after the car has stopped
When we draw a diagram of the forces acting on an extended object, the tail of the force vector for the weight should be at 1. The object's center of gravity. 2. The object's moment of inertia. 3. The object's center. 4. The object's center of rotation.
1. The object's center of gravity.
The acceleration vector of a particle in projectile motion ________. 1. Is directed down at all times. 2. Points along the path of the particle. 3. Is directed horizontally. 4. Vanishes at the particle's highest point.
1. is directed down at all times
Ax is positive if is directed _______; Ay is positive if is directed _______. 1. right / up 2. right / down 3. left / up
1. right / up
The video showed examples of vector operations on which two vector quantities? 1. Acceleration and force 2. Displacement and acceleration 3. Velocity and force 4. Velocity and acceleration 5. Displacement and velocity
4. velocity and acceleration
Making rough estimates of physical quantities is useful
So that you can see if the answer to a problem makes physical sense.
Section 2
(10 cards)