# Preap Physics Exam #5 Numbers 16-20

5 Questions | Total Attempts: 128  Settings  .

• 1.
16. In what kind of collision is kinetic energy always conserved?
• A.

A. elastic collision

• B.

B. inelastic collision

• C.

C. perfectly elastic collision

• D.

D. perfectly inelasticd. perfectly inelastic collision

• 2.
17. A helium atom collides with another helium 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.
18. Two playground 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.
19. In an inelastic 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.
20. A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball?
• A.

a. It maintains its initial velocity.

• B.

b. It has one-half its initial velocity.

• C.

c. It comes to rest.

• D.

d. It moves in the opposite direction. Back to top