# Exam 5 Target 7 Retake Physics 2016-2017

5 Questions | Total Attempts: 48

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• 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.