# Preap Physics Exam #5 Numbers 6-10

5 Questions | Total Attempts: 142

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• 1.
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.

A. increased.

• B.

B. remained the same.

• C.

C. decreased.

• D.

D. was conserved.

• 2.
7.  The law of conservation of momentum states that
• A.

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

• B.

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

• C.

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

• D.

D. the total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the objects.

• 3.
8.  When two ice skaters initially at rest push off one another, their final momenta are
• A.

a. equal in magnitude and direction.

• B.

b. equal in magnitude and opposite in direction.

• C.

c. in the same direction but of different magnitudes

• D.

d. in opposite directions and possibly of different magnitudes.

• 4.
9.  When two objects interact in an isolated system,
• A.

a. the momentum of each object is conserved.

• B.

b. the total momentum of the system is zero.

• C.

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

• D.

d. the total momentum is always conserved.

• 5.
10.  Conservation of momentum follows from
• A.

A. Newton’s first law.

• B.

B. Newton’s second law.

• C.

C. Newton’s third law.

• D.

D. the law of conservation of energy.