Section 1
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An unbalaced force on an object will result in.. a. a change is speed b. a change in direction c. a change in speed and/or direction d. no change in motion
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Section 1
(50 cards)
An unbalaced force on an object will result in.. a. a change is speed b. a change in direction c. a change in speed and/or direction d. no change in motion
c. a change in speed and/or direction
T/F If a hockey puck were to slide on a perfectly friction less surface, it will eventually slow down because of its inertia.
False
If you push a wall and the wall pushes back this is an example of which law? a. Newton's 1st law b. Newton's 2nd law c. Newtons's 3rd law d. Newton's 4th law
c. Newtons's 3rd law
A bomb is launched at an angle of 25 degrees. We know that the initial velocity is 5 m/s and its horizontal velocity is 7 m/s. at any given point while the bomb is in the air, what is the horizontal acceleration? a. 5 b. 9.8 c. 7 d. 0
d. 0
Starting from rest, object A falls freely for 1.0s and object B falls freely for 3.0s. Compared with object B, object A falls: a. three times as far b. nine times as far c. one-third as far d. one-ninth as far
d. one-ninth as far
T/F The combination of all forces that act on an object is called the net force.
True
A ball is tossed vertically upward and caught by the thrower. When it leaves the person's hand, the ball has: a. more acceleration than it does at the top b. zero velocity c. maximum velocity d. zero acceleration
c. maximum velocity
At a diner, a customer slides an empty coffee cup down the counter for a refill. A cup slides off the counter and strikes the floor at a distance d from the base of the counter. If the height of the counter is h, find an expression for the speed the mug must leave the counter. a. v(2h/g) b. d*v(2h/g) c. d/v(2h/g) d. 2gh
c. d/v(2h/g)
T/F As an object moves from planet to planet, its mass changes.
False
Two bicycles, starting at rest from two different points, uniformly accelerate at the same rate from rest along a street. The first rides for 15s, the other for 30s. What is the distance the second bicycle has traveled relative to the first? a. half b. four times c. twice d. quarter
b. four times
In order to maximize our range (that is the horizontal distance traveled) we would need to launch a cannon ball at what angle from ground level? a. 60 degrees b. 30 degrees c. 75 degrees d. 45 degrees
d. 45 degrees
You are bowling at a brand new friction less bowling lanes. You roll the ball and let go. The ball will... a. stop immediately b. keep on going until another force interferes c. roll for a little bit, but eventually stop
b. keep on going until another force interferes
Beth pushes Haley with 2 N of foce how much force does Haley exert on Beth? a. 10 N b. 2 N c. 5 N d. 0 N
b. 2 N
A ball rolls off of a table, after the ball exits the table the horizontal velocity will...(no air resistance) a. increase b. decrease c. stay the same d. increase and then decrease
c. stay the same
T/F If an object is in motion it must have a force acting on it.
False
A ball is tossed vertically upward. At the top of its path, the ball has: a. maximum velocity b. zero velocity c. zero acceleration d. less acceleration than it does at the bottom
b. zero velocity
A 5.0 kg book is resting one a table. The force exerted on the book by the table is... a. 5.0 N b. 0 N c. 49 N d. None of these
c. 49 N
A bomb is released from a plane moving horizontally, after the bomb is released the horizontal acceleration will be: a. 9.8 m/s^2 b. cannot be found c. -9.8 m/s^2 d. 0 m/s^2
d. 0 m/s^2
T/F A rocket ship is pushed forward by gases that are forced out the back of the ship.
True
An unbalanced force is an example of which law? a. Newton's 1st law b. Newton's 2nd law c. Newtons's 3rd law d. Newton's 8th law
b. Newton's 2nd law
A 20 N falling object encounters 4 N of air resistance. The amount of net force acting on the object is a. 24 N b. 0 N c. 80 N d. 16 N
d. 16 N
If you increase the mass of an object while the force exerted on it remains constant, the acceleration... a. increases b. decreases c. stays the same d. increases then decreases
b. decreases
A 10 N force acting to the right and a 30 N force acting to the left act on an object. What is the net force? a. 40 N to the left b. 40 N to the right c. 20 n to the left d. 20 N to the right
c. 20 N to the left
When an object reaches terminal velocity its acceleration is a. 9.8 b. 0 c. half its speed d. cannot be determined
b. 0
A bomb is launched by a cannon at same angle. Once it leaves the cannon, what is happening to the horizontal velocity? a. Increasing only b. Decreasing Only c. Decreasing then increasing d. Remains constant
d. Remains constant
T/F Weight is measured in kilograms.
False
A gun is fired horizontally, we will call this bullet A. At the same time bullet B is dropped from the same height. Which bullet will hit the ground first? a. Bullet A b. Bullet B c. Both will hit at the same time d. depends on the speed which bullet A is fired
c. Both will hit at the same time
Two bicycles, starting from rest, race each other. The first finishes the race in 30s; the other 15s. How much does the first bicycle accelerate compared to the second? a. twice b. half c. four times d. one-fourth
d. one-fourth
A book is lying on a table if Ms. Holmes sits on the book the normal force acting on the book... a. stays the same b. increases c. decreases d. depends on how much Ms. Holmes weighs
b. increases
What happens to the acceleration of an object when the mass is decreased, but the force acting on the object remains constant? a. remains constant b. increases c. decreases
b. increases
The area under an Acceleration vs Time graph represents: a. change in velocity b. acceleration c. change and position d. instantenous velocity
a. change in velocity
A ball is lunched by a marble launcher at some angle. Once it leaves the launcher, what is happening to the vertical velocity? a. Increasing only b. Decreasing only c. Increasing then decreasing d. Decreasing, stops, then increasing
d. Decreasing, stops, then increasing
A speed boat accelerates at 3.0 m/s^2 from rest. The boat will reach a speed of 12m/s at the end of: a. 36 sec b. 4.0 sec c. 6.0 sec d. 9.0 sec
b. 4.0 sec
Two bicycles, starting at the same point, accelerate from the rest down a driveway. The first finishes the trip in 20s; the other in 10s. How much does the second bicycle accelerate compared to the first? a. twice b. four times c. one-fourth d. half
b. four times
The more mass an object has... a. the more it resists a change in motion b. the less it resists a change in motion c. will not affect its resistance to a change in motion
a. the more it resists a change in motion
Compared to its mass on Earth, the mass of a 10 kg object on the moon will be a. more b. less c. the same
c. the same
If a book is lying on a table and well pull up on the book, the normal force acting on the book will... a. decrease b. increase c. remain constant
a. decrease
You are at a magic sow watching a magician pull a table cloth out from under a set of plates. This is an example of..... a. Newton's 1st law b. Newton's 2nd law c. Newtons's 3rd law d. Holmes law (law of awesomeness)
a. Newton's 1st law
In soccer, a goal keeper places the ball on the ground and kicks it. The player's foot is in contact with ball for .8m. If it attains a final velocity of 40 m/s, it acceleration is: a. 1000 m/s^2 b. 25 m/s^2 c. 50 m/s^2 d. 2000 m/s^2
a. 1000 m/s^2
T/F If an object has balanced forces, its acceleration is zero.
True
At a diner, a customer slides an empty coffee cup down the counter for a refill. A cup slides off the counter and strikes the floor at a distance d from the base of the counter. If the height of the counter is h, find an expression for the time t it takes the cup to fall to the floor. a. v(2h/g) b. d*v(2h/g) c. d/v(2h/g) d. 2gh
a. v(2h/g)
A 600 N book is laying on a table. An 800 N force is then applied upwards on the book. What is the normal force acting on the book? a. 200 N b. -200 N c. 0 N d. 1400 N
c. 0 N
Compared to its weight on Earth, a 10 kg object on the moon will weigh a. more b. less c. the same
b. less
A sailor drops a wrench from the top of a sailboat's vertical mast while the boat is moving rapidly and steadily straight forward. Where will the wrench hit the deck? a. ahead of the base of the mast b. at the base of the mast c. behind the base of the mast d. none of these
b. at the base of the mast
At the peak of its trajectory, a ball thrown vertically upward has zero: a. velocity b. acceleration c. mass d. height
a. velocity
A physics book lies at rest on top of a desk. A student states there is no force acting on the book. How should this statement be changed to make it correct? a. There is a net force acting on the book. b. Net force is equal to zero. c. There is no vertical force acting on the book. d. There is only one force acting on the book; gravity.
b. Net force is equal to zero.
A NASA astronaut hits a golf ball on the Moon, which of the following quantities, if any, remains constant as the balls travels through the lunar vacuum? a. vertical component of the velocity b. acceleration c. velocity d. horizontal component of the velocity e. none of these
b. acceleration and d. horizontal component of the velocity
T/F Inertia is the property that every object has; inertia resists changes in an object's state of motion.
True
The motion of a object thrown vertically upward is affected by the acceleration of gravity: a. during the downward motion only b. during its upward motion c. during both its upward and downward motions d. less than if the ball were just dropped
c. during both its upward and downward motions
Starting at rest, an apple and orange fall from trees. The apple falls for 0.4s and the orange for 0.8s. When hitting the ground, how fast is the apple moving compared to the orange? a. twice b. half c. four times d. one-fourth
b. half
Section 2
(14 cards)