Preap Physics Exam #5 Numbers 6-10

1. 9. When two objects interact in an isolated system,

A. the momentum of each object is conserved.

B. the total momentum of the system is zero.

C. the total momentum is conserved only if the objects move in opposite directions.

D. the total momentum is always conserved.

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2. 8. When two ice skaters initially at rest push off one another, their final momenta are

A. equal in magnitude and direction.

B. equal in magnitude and opposite in direction.

C. in the same direction but of different magnitudes

D. in opposite directions and possibly of different magnitudes.

3. 6. A 75 kg person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person

A. increased.

B. remained the same.

C. decreased.

D. was conserved.

4. 10. Conservation of momentum follows from

A. Newton’s first law.

B. Newton’s second law.

C. Newton’s third law.

D. the law of conservation of energy.

5. 7. The law of conservation of momentum states that

A. the total initial momentum of all objects interacting with one another usually equals the total final momentum.

B. The total initial momentum of all objects interacting with one another does not equal the total final momentum.

C. the total momentum of all objects interacting with one another is zero.