Kinetic Energy and the Work-Energy Theorem Quiz
The question sheet
Reveal any answer as you study-
As a toy car goes around a loop-the-loop, what is gravity's effect on kinetic energy on the upward side, at the top, and on the downward side?
- increases, has no effect on, decreases
- decreases, has no effect on, increases
- decreases, increases, has no effect on
- increases, decreases, has no effect on
Reveal answer
Answer: decreases, has no effect on, increases
Source evidence
PDF page 352: 6. A toy car is going around a loop-the-loop. Gravity
PDF page 353: loop, ____ the kinetic energy at the top, and ____
PDF page 353: a. increases, decreases, has no effect on
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When a force acts on an object parallel to the motion of the center of mass, the mechanical energy does what?
- stays the same
- reverses
- increases
- decreases
Reveal answer
Answer: increases
Source evidence
PDF page 353: the direction of the motion of the center of mass,
PDF page 353: the mechanical energy ____. When the force
PDF page 353: a. increases, increases
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When a force acting on an object is antiparallel to the motion of the center of mass, the mechanical energy does what?
- decreases
- increases
- stays constant
- doubles
Reveal answer
Answer: decreases
Source evidence
PDF page 353: acting on an object is antiparallel to the direction of the center of mass, the mechanical energy
PDF page 353: a. increases, increases
PDF page 353: b. increases, decreases
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A 2000-kg airplane lands 5 degrees below horizontal with a 40 kN drag force acting directly rearward. Ignoring thrust and lift, kinetic energy will do what?
- stay constant
- oscillate
- increase
- decrease
Reveal answer
Answer: decrease
Source evidence
PDF page 353: 10. A 2000-kg airplane is coming in for a landing, with
PDF page 353: a velocity 5 degrees below the horizontal and a drag force of 40 kN acting directly rearward. Ignoring thrust and lift on the plane, kinetic energy
PDF page 353: will ____ due to the net force of ____.
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A model drag car is accelerated from rest by a 75 N motor force against a 30 N drag force. What net force acts along the track?
- 30 N
- 45 N
- 105 N
- 75 N
Reveal answer
Answer: 45 N
Source evidence
PDF page 353: 12. A model drag car is being accelerated along its
PDF page 353: track from rest by a motor with a force of 75 N, but there is a drag force of 30 N due to the track. What is the kinetic energy after 2 m of travel?
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In the potato cannon problem, the cannon is aimed at what angle above the horizontal?
- 30.0 degrees
- 5 degrees
- 135 degrees
- 45 N
Reveal answer
Answer: 30.0 degrees
Source evidence
PDF page 353: potato cannon. The cannon is 1.5 m long and is aimed 30.0 degrees above the horizontal. It exerts an average 45 N force on the potato. Ignoring friction, what is the kinetic energy of the potato as it leaves the muzzle of the potato cannon?
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A child pulls two 10 kg wagons tied together, exerting 30 N over 5.0 m. This determines the change in what for the two-wagon system?
- acceleration
- kinetic energy
- momentum
- mass
Reveal answer
Answer: kinetic energy
Source evidence
PDF page 353: 16. A child is pulling two red wagons, with the second
PDF page 353: one tied to the first by a (non-stretching) rope. Each wagon has a mass of 10 kg. If the child exerts a force of 30 N for 5.0 m, how much has the kinetic energy of the two-wagon system changed?
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In the two-wagon system, each wagon has a mass of what value?
- 20 kg
- 30 kg
- 5.0 kg
- 10 kg
Reveal answer
Answer: 10 kg
Source evidence
PDF page 353: one tied to the first by a (non-stretching) rope. Each wagon has a mass of 10 kg. If the child exerts a force of 30 N for 5.0 m, how much has the kinetic energy of the two-wagon system changed?
PDF page 353: 16. A child is pulling two red wagons, with the second
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In the child-pulling problem, the second wagon is connected to the first by what kind of rope?
- a bungee cord
- a rigid rod
- a stretching rope
- a non-stretching rope
Reveal answer
Answer: a non-stretching rope
Source evidence
PDF page 353: one tied to the first by a (non-stretching) rope. Each wagon has a mass of 10 kg. If the child exerts a force of 30 N for 5.0 m, how much has the kinetic energy of the two-wagon system changed?
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In the dog-sled problem, at what angle from your direction of travel is the 300 N wind blowing?
- 90 degrees
- 135 degrees
- 30 degrees
- 45 degrees
Reveal answer
Answer: 135 degrees
Source evidence
PDF page 353: dogs are pulling you across a frozen lake with a force of 1200 N while a 300 N wind is blowing at you at 135 degrees from your direction of travel. What is the net force, and will your kinetic energy increase or decrease?
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If wind blows at a car at 30 degrees from the direction of travel, then at 135 degrees, the kinetic energy will do what respectively?
- increase, decrease
- decrease, decrease
- increase, increase
- decrease, increase
Reveal answer
Answer: increase, decrease
Source evidence
PDF page 353: angle of 30 degrees from the direction of travel, the
PDF page 353: kinetic energy will ____. If the wind is blowing at a
PDF page 353: a. increase, increase
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A roller coaster track is shaped like a perfect cosine. The problem asks students to describe kinetic energy over what interval?
- one half period
- the first full period
- one quarter period
- two full periods
Reveal answer
Answer: the first full period
Source evidence
PDF page 353: 7. A roller coaster is set up with a track in the form of a
PDF page 353: perfect cosine. Describe and graph what happens to the kinetic energy of a cart as it goes through the first full period of the track.
AP College Physics
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