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AP Physics: U3S2 Energy Exam Questions with Answers, Exams of Physics

University of Oregon (UO)Physics

A comprehensive set of multiple-choice questions and answers covering the topic of energy in ap physics. It includes various concepts related to potential energy, kinetic energy, conservation of energy, collisions, and thermal energy. Designed to help students prepare for exams and deepen their understanding of energy principles.

Typology: Exams

2024/2025

Available from 12/07/2024

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AP Physics: U3S2 Energy Exam
Questions with Answers Latest Edition
1. Which of these is not a conservative force and does not have a
form of potential energy connected with it? - Correct Ans:
✔✔friction
2. Which of these is true about kinetic energy but not necessarily
true about potential energy? - Correct Ans: ✔✔the kinetic engery
of an object is never negative
3. A 22 kg sled is pushed for 5.2 m with a horizontal force of 20 N,
starting from rest. Ignore friction. Find the final speed of the sled.
- Correct Ans: ✔✔3.1 m/s
4. A 1,200 kg car rolls down a hill with its brakes off and transmission
in neutral. At one moment it is moving 5.0 m/s. A little later it is
moving at 8.2 m/s. How much did its height change between the
two times? Assume friction and air resistance have no effect on its
motion. - Correct Ans: ✔✔2.2 m
5. An 80.0 kg hiker walks a distance of 400.0 m along a road that
slopes 5.0 degrees upward, and then stops. What is the hiker's
final gravitational potential energy relative to her original
position? You may use a trigonometry table. - Correct Ans:
✔✔2.7 x 10^4 J
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Download AP Physics: U3S2 Energy Exam Questions with Answers and more Exams Physics in PDF only on Docsity!

AP Physics: U3S2 Energy Exam

Questions with Answers Latest Edition

  1. Which of these is not a conservative force and does not have a form of potential energy connected with it? - Correct Ans: ✔✔friction
  2. Which of these is true about kinetic energy but not necessarily true about potential energy? - Correct Ans: ✔✔the kinetic engery of an object is never negative
  3. A 22 kg sled is pushed for 5.2 m with a horizontal force of 20 N, starting from rest. Ignore friction. Find the final speed of the sled.
    • Correct Ans: ✔✔3.1 m/s
  4. A 1,200 kg car rolls down a hill with its brakes off and transmission in neutral. At one moment it is moving 5.0 m/s. A little later it is moving at 8.2 m/s. How much did its height change between the two times? Assume friction and air resistance have no effect on its motion. - Correct Ans: ✔✔2.2 m
  5. An 80.0 kg hiker walks a distance of 400.0 m along a road that slopes 5.0 degrees upward, and then stops. What is the hiker's final gravitational potential energy relative to her original position? You may use a trigonometry table. - Correct Ans: ✔✔2.7 x 10^4 J
  1. Which of these is equivalent to the law of conservation of energy?
    • Correct Ans: ✔✔The total energy of all types remains the same in a closed system.
  2. As a rock falls without air resistance, which of the following is true? - Correct Ans: ✔✔Part of the potential energy of the rock becomes kinetic energy during each part of the fall.
  3. A 10.3 kg block of ice slides without friction down a long track. The start of the track is 4.2 m higher than the end of the track, and the path traveled is 8.0 m. Find the speed of the block when it reaches the end of the track. - Correct Ans: ✔✔9.1 m/s
  4. A 1,400 kg car is moving at 12 m/s when the driver stops the car. What increase in the thermal energy of the car and its surroundings results from applying the brakes to bring the car to a stop? Ignore other sources of thermal energy. - Correct Ans: ✔✔1.0 x 10^5 J
  5. A rock that had been dropped from a high platform is moving with a kinetic energy of 180 J when it strikes the ground. Ignore air resistance. What kinetic energy did the rock have when it had fallen one-third of the distance to the ground? - Correct Ans: ✔✔60 J
  1. A 0.145 kg baseball is thrown from a platform above the ground at a 10 m/s. The ball is moving 15 m/s when it strikes the ground. From what height above the ground was the ball thrown?
    • Correct Ans: ✔✔6 m
  2. An extremely elastic ball loses only 20 percent of its kinetic energy in a bounce. If such a ball were dropped from a height of 5.0 m, how high would the ball bounce? - Correct Ans: ✔✔4.0 m
  3. Which of these is the best example of an elastic collision? - Correct Ans: ✔✔A billiard ball strikes another of the same mass at rest and stops, and the second ball then moves with the same velocity as the first ball.
  4. Which of these is true of an inelastic collision between two objects in a closed system but not of an elastic collision? - Correct Ans: ✔✔Kinetic energy is less after the collision.
  5. Two objects, A and B, each of mass 0.22 kg, are moving at 0.34 m/s directly toward each other. What is the speed of Object A after an elastic collision? - Correct Ans: ✔✔0.34 m/s
  6. Two objects, A and B, each of mass 0.22 kg, are moving at 0.52 m/s directly toward each other. A completely inelastic collision occurs and both objects stop. What percentage of the

total kinetic energy is changed into other forms of energy? - Correct Ans: ✔✔100 percent

  1. A 0.22 kg air-track glider moving at 0.60 m/s collides elastically into a 0.44 kg glider at rest. After collision the 0.22 kg glider is moving with velocity - 0.20 m/s. What is the speed of the 0.44 kg glider after collision? - Correct Ans: ✔✔.40 m/s
  2. Which of these is true about momentum and kinetic energy in a collision within a closed system? - Correct Ans: ✔✔Momentum is conserved, but total kinetic energy may or may not be conserved.
  3. Which of these is an experiment generally regarded as being first carried out by James Joule? - Correct Ans: ✔✔measuring the temperature increase of water from doing work stirring it
  4. What did Joule's experiment directly show? - Correct Ans: ✔✔Heat is a form of energy.
  5. What kind of energy is the source of the light and heat produced by a burning log? - Correct Ans: ✔✔chemical energy