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Elastic Collisions in One Dimension Quiz

12 questions physics Grades 9-12

The question sheet

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  1. In an elastic collision, which quantities are conserved?

    • Both momentum and kinetic energy
    • Only momentum
    • Neither momentum nor kinetic energy
    • Only kinetic energy
    Reveal answer

    Answer: Both momentum and kinetic energy

    Source evidence

    PDF page 395: Mass A is initially moving 12 m/s in the +x-direction. Mass B is initially moving 12 m/s in the –x-direction. Assuming that the collision is elastic, calculate the final velocity of both masses after the collision. Show that your results are consistent with conservation of momentum and conservation of kinetic energy.

    PDF page 395: a. Both momentum and kinetic energy are

  2. A rubber ball dropped from a fixed height rebounds to only 90% of that height. What best explains the lost kinetic energy?

    • Gravity added energy
    • Energy deformed the ball's shape
    • Momentum was not conserved
    • No energy was lost
    Reveal answer

    Answer: Energy deformed the ball's shape

    Source evidence

    PDF page 394: height. It bounces off a hard floor and rebounds upward, but it only reaches 90% of its original fixed height. What is the best way to explain the loss of kinetic energy of the ball during the collision?

    PDF page 394: a. Energy was required to deform the ball’s

    PDF page 394: shape during the collision with the floor.

  3. If two colliding masses stick together and move as one afterward, this describes what type of collision?

    • Reversible collision
    • Elastic collision
    • Frictionless collision
    • Inelastic collision
    Reveal answer

    Answer: Inelastic collision

    Source evidence

    PDF page 395: c. After the collision, the two masses stick

    PDF page 395: together and move 7 m/s in the +x-direction.

    PDF page 395: inelastic collision?

  4. For an inelastic collision, which statement is true?

    • Momentum not conserved, energy conserved
    • Momentum conserved, kinetic energy not
    • Momentum and kinetic energy conserved
    • Neither conserved
    Reveal answer

    Answer: Momentum conserved, kinetic energy not

    Source evidence

    PDF page 395: a. Momentum is conserved, and kinetic energy

    PDF page 395: b. Momentum is conserved, and kinetic energy

  5. Object A (12 m/s, +x) hits object B at rest; afterward A is at rest and B moves off, with no external forces. What can we conclude?

    • More information is needed
    • Both momentum and KE conserved
    • Neither is conserved
    • Momentum conserved, KE may not be
    Reveal answer

    Answer: More information is needed

    Source evidence

    PDF page 395: initially moving in the +x-direction with a speed of 12 m/s, and object B is initially at rest. After the collision, object A is at rest, and object B is moving away with some unknown velocity. There are no external forces acting on the system of two masses. What statement can we make about this collision?

    PDF page 395: c. Neither momentum nor kinetic energy is

    PDF page 395: d. More information is needed in order to

  6. Two equal masses collide elastically: A moves 12 m/s in +x, B moves 12 m/s in -x. What must be checked in the final velocities?

    • Only kinetic energy conservation
    • Only momentum conservation
    • Only that they stick together
    • Both momentum and kinetic energy
    Reveal answer

    Answer: Both momentum and kinetic energy

    Source evidence

    PDF page 395: Mass A is initially moving 12 m/s in the +x-direction. Mass B is initially moving 12 m/s in the –x-direction. Assuming that the collision is elastic, calculate the final velocity of both masses after the collision. Show that your results are consistent with conservation of momentum and conservation of kinetic energy.

  7. In an elastic collision, mass A (5.0 m/s +x) and B (3.0 m/s -x) collide; A ends at 3.0 m/s -x. What is B's final velocity?

    • 3.0 m/s in the +x-direction
    • 5.0 m/s in the -x-direction
    • 5.0 m/s in the +x-direction
    • 3.0 m/s in the -x-direction
    Reveal answer

    Answer: 5.0 m/s in the +x-direction

    Source evidence

    PDF page 395: elastically. Mass A is initially moving 5.0 m/s in the +x-direction prior to the collision. Mass B is initially moving 3.0 m/s in the –x-direction prior to the collision. After the collision, mass A will be moving with a velocity of 3.0 m/s in the –x-direction. What will be the velocity of mass B after the collision?

    PDF page 395: b. 5.0 m/s in the +x-direction

  8. According to the source, when the momentum change of a two-car system may depend on collision details, it depends on whether the collision is what?

    • Frictionless
    • Head-on
    • At rest
    • Elastic
    Reveal answer

    Answer: Elastic

    Source evidence

    PDF page 394: d. It depends on whether the collision is elastic

  9. When a tennis ball rebounds off a wall at slightly less speed, what conserves overall momentum?

    • The wall/Earth's momentum change
    • The ball's spin
    • No conservation occurs
    • Air resistance
    Reveal answer

    Answer: The wall/Earth's momentum change

    Source evidence

    PDF page 394: 28. A tennis ball strikes a wall with an initial speed of

    PDF page 394: 15 m/s. The ball bounces off the wall but rebounds with slightly less speed (14 m/s) after the collision. Explain (a) what else changed its

    PDF page 395: momentum in response to the ball’s change in momentum so that overall momentum is conserved, and (b) how some of the ball’s kinetic energy was lost.

  10. A rubber ball rebounds to only 90% of its height. This indicates the collision with the floor was what?

    • Frictionless
    • Not perfectly elastic
    • Zero-momentum
    • Perfectly elastic
    Reveal answer

    Answer: Not perfectly elastic

    Source evidence

    PDF page 394: 27. A rubber ball is dropped from rest at a fixed

    PDF page 394: height. It bounces off a hard floor and rebounds upward, but it only reaches 90% of its original fixed height. What is the best way to explain the loss of kinetic energy of the ball during the collision?

  11. For an elastic collision, in addition to conservation of momentum, what fact is used to predict final velocities?

    • Velocity always reverses
    • Objects stick together
    • Mass is destroyed
    • Kinetic energy is conserved
    Reveal answer

    Answer: Kinetic energy is conserved

    Source evidence

    PDF page 395: elastically. Mass A is initially moving 4.0 m/s in the +x-direction prior to the collision. Mass B is initially moving 8.0 m/s in the –x-direction prior to the collision. After the collision, mass A will be moving with a velocity of 8.0 m/s in the –x-direction. (a) Use the principle of conservation of momentum to predict the velocity of mass B after the collision. (b) Use the fact that kinetic energy is conserved in elastic collisions to predict the velocity of mass B after the collision.

  12. Two colliding objects stick together after impact. This means kinetic energy is what?

    • Fully conserved
    • Not fully conserved
    • Increased
    • Reversed
    Reveal answer

    Answer: Not fully conserved

    Source evidence

    PDF page 395: c. After the collision, the two masses stick

    PDF page 395: b. Momentum is conserved, and kinetic energy

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Source

AP College Physics

AP College Physics by OpenStax, used under CC BY 4.0. Changes made by Stratacademy.

Original textbook · CC BY 4.0

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