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8 - Momentum, Impulse, and Collisions Online Quiz Questions

Use this free practice quiz with 20 questions to review 8 - Momentum, Impulse, and Collisions, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

True or false: In one-dimensional motion, an object moving in the negative direction has negative momentum if its mass is positive.

  1. A

    True

  2. B

    False

02
Choose one
1 point

A (1.5 kg)(1.5\,\text{kg}) cart moving at (4.0 m/s)(4.0\,\text{m/s}) to the right collides with a stationary (0.5 kg)(0.5\,\text{kg}) cart, and they stick together. What is their final velocity?

  1. A

    1.0 m/s

  2. B

    2.0 m/s

  3. C

    3.0 m/s

  4. D

    4.0 m/s

03
True or false
1 point

True or false: Every collision with negligible external impulse conserves both total momentum and total kinetic energy.

  1. A

    True

  2. B

    False

04
Choose all
1 point

Select all statements that are correct for a system with negligible net external impulse during a collision.

  1. A

    The total momentum of an isolated system remains constant.

  2. B

    The momentum of every individual object in the system remains constant.

  3. C

    Internal forces can transfer momentum between objects in the system.

  4. D

    The total kinetic energy remains constant in every isolated collision.

05
Fill in the blank
1 point

The center of mass is the position of a system, and it lies closer to the .

06
Choose all
1 point

Select all statements that correctly describe how increasing the duration of a collision affects force and momentum.

  1. A

    Increasing the collision time can reduce the average force.

  2. B

    For the same change in momentum, doubling the collision time halves the average force.

  3. C

    A longer collision time necessarily produces a larger change in momentum.

  4. D

    Airbags reduce average force partly by increasing the time over which momentum changes.

07
Written response
1 point

A (2.0 kg)(2.0\,\text{kg}) object is at (x=0 m)(x=0\,\text{m}) and a (6.0 kg)(6.0\,\text{kg}) object is at (x=4.0 m)(x=4.0\,\text{m}). What is the position of their center of mass? Enter the value in metres.

08
Open ended
1 point

Two carts collide elastically on a level track. Cart 1 has mass (0.80 kg)(0.80\,\text{kg}) and initially moves right at (5.0 m/s)(5.0\,\text{m/s}). Cart 2 has mass (1.20 kg)(1.20\,\text{kg}) and initially moves left at (2.0 m/s)(2.0\,\text{m/s}). Determine the final velocity of each cart, showing how your system choice and conservation laws determine the result.

09
Choose one
1 point

Object A has a mass of 2.0 kg2.0\,\text{kg} and moves at 3.0 m/s3.0\,\text{m/s}. Object B has a mass of 6.0 kg6.0\,\text{kg} and moves at 1.0 m/s1.0\,\text{m/s}. Which object has the greater kinetic energy?

  1. A

    Object A, because its kinetic energy is greater.

  2. B

    Object B, because its mass is greater.

  3. C

    They have equal kinetic energy because they have equal momentum.

  4. D

    There is not enough information to compare their kinetic energies.

10
True or false
1 point

True or false: Internal forces can change the total momentum of an isolated system.

  1. A

    True

  2. B

    False

11
Choose one
1 point

A 0.15 kg0.15\,\text{kg} baseball initially travels at +40 m/s+40\,\text{m/s} and leaves a bat at −50 m/s-50\,\text{m/s}. What is the impulse on the baseball?

  1. A

    13.5 N⋅s13.5\,\text{N}\cdot\text{s}

  2. B

    −13.5 N⋅s-13.5\,\text{N}\cdot\text{s}

  3. C

    −1.5 N⋅s-1.5\,\text{N}\cdot\text{s}

  4. D

    6.0 N⋅s6.0\,\text{N}\cdot\text{s}

12
Choose one
1 point

Two carts collide on a nearly frictionless track. If the two carts are the system and the external horizontal impulse is negligible, which statement is justified?

  1. A

    The momentum of each cart remains unchanged individually.

  2. B

    The total kinetic energy must be conserved.

  3. C

    The total momentum before the collision equals the total momentum after the collision.

  4. D

    The final velocity of each cart must equal its initial velocity.

13
Choose one
1 point

A 0.50 kg0.50\,\text{kg} cart moving at 4.0 m/s4.0\,\text{m/s} to the right collides with a stationary 1.5 kg1.5\,\text{kg} cart. The carts stick together. What is their final velocity?

  1. A

    0.50 m/s0.50\,\text{m/s} to the right

  2. B

    1.0 m/s1.0\,\text{m/s} to the right

  3. C

    2.0 m/s2.0\,\text{m/s} to the right

  4. D

    4.0 m/s4.0\,\text{m/s} to the right

14
Written response
1 point

A 4.0 kg4.0\,\text{kg} launcher initially at rest fires a 0.020 kg0.020\,\text{kg} projectile at 200 m/s200\,\text{m/s} to the right. Neglect external horizontal impulse. What is the launcher's recoil velocity in m/s\text{m/s}?

15
Written response
1 point

A 0.50 kg0.50\,\text{kg} object changes velocity from +12 m/s+12\,\text{m/s} to −8 m/s-8\,\text{m/s} in 0.20 s0.20\,\text{s}. What is its average net force in N\text{N}?

16
Choose one
1 point

A 2.0 kg2.0\,\text{kg} object is at x=0 mx=0\,\text{m}, and a 6.0 kg6.0\,\text{kg} object is at x=4.0 mx=4.0\,\text{m}. Where is the center of mass?

  1. A

    2.0 m2.0\,\text{m}

  2. B

    3.0 m3.0\,\text{m}

  3. C

    4.0 m4.0\,\text{m}

  4. D

    6.0 m6.0\,\text{m}

17
Choose one
1 point

A system of particles has total mass 10 kg10\,\text{kg} and experiences a net external force of 30 N30\,\text{N} in the positive xx-direction. What is the acceleration of its center of mass?

  1. A

    0.30 m/s20.30\,\text{m/s}^2

  2. B

    3.0 m/s23.0\,\text{m/s}^2

  3. C

    20 m/s220\,\text{m/s}^2

  4. D

    300 m/s2300\,\text{m/s}^2

18
Choose one
1 point

A net force acts along one axis. It is +8 N+8\,\text{N} from t=0t=0 to t=2.0 st=2.0\,\text{s}, then −4 N-4\,\text{N} from t=2.0t=2.0 to t=5.0 st=5.0\,\text{s}. What is the net impulse over the full 5.0 s5.0\,\text{s} interval?

  1. A

    −28 N⋅s-28\,\text{N}\cdot\text{s}

  2. B

    +4 N⋅s+4\,\text{N}\cdot\text{s}

  3. C

    +12 N⋅s+12\,\text{N}\cdot\text{s}

  4. D

    +28 N⋅s+28\,\text{N}\cdot\text{s}

19
Written response
1 point

A constant net force of +12 N+12\,\text{N} acts on an object for 0.25 s0.25\,\text{s}. What is the impulse, in N⋅s\text{N}\cdot\text{s}?

20
Fill in the blank
1 point

For a varying force, the impulse is the on a force-versus-time graph. In SI units, impulse is measured in a .