Exam 5 Target 7 Retake Physics 2016-2017

5 Questions | Total Attempts: 48

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Exam 5 Target 7 Retake Physics 2016-2017

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Questions and Answers
  • 1. 
    Which of the following best describes the momentum of two bodies after a two-body collision if the kinetic energy of the system is conserved?
    • A. 

      A. must be less

    • B. 

      B. might also be conserved

    • C. 

      C. must also be conserved

    • D. 

      D. is doubled in value

  • 2. 
    A carbon atom collides with another carbon atom in an elastic collision. Which of the following is true?
    • A. 

      a. Both momentum and kinetic energy are conserved.

    • B. 

      b. Momentum is conserved but kinetic energy is not conserved.

    • C. 

      c. Kinetic energy is conserved but momentum is not conserved.

    • D. 

      d. Neither momentum nor kinetic energy is conserved.

  • 3. 
    Two soccer balls collide in an inelastic collision. Which of the following is true?
    • A. 

      a. Both momentum and kinetic energy are conserved.

    • B. 

      b. Momentum is conserved, but kinetic energy is not conserved.

    • C. 

      c. Kinetic energy is conserved, but momentum is not conserved.

    • D. 

      d. Neither momentum nor kinetic energy is conserved.

  • 4. 
    In an elastic collision between two objects with unequal masses,
    • A. 

      a. the total momentum of the system will increase.

    • B. 

      b. the total momentum of the system will decrease.

    • C. 

      c. the kinetic energy of one object will increase by the amount that the kinetic energy of the other object decreases.

    • D. 

      d. the momentum of one object will increase by the amount that the momentum of the other object decreases.

  • 5. 
    1. In practice, a red ice hockey puck collides with a blue, stationary hockey puck in an elastic head-on collision.  Both the red and blue pucks have equal masses.  Which statement is true of the pucks after the collision.
    • A. 

      A. Both the red and blue pucks move away together.

    • B. 

      B. The blue puck stops the red puck, then moves away from the collision with twice the red puck’s original velocity.

    • C. 

      C. The blue puck stops the red puck, then moves away from the collision with half of the red puck’s original velocity.

    • D. 

      D. The blue puck moves in the same direction, with the same velocity, as the red puck’s initial velocity. The red puck comes to rest.

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