Chapter 7: Linear Momentum
4 Questions
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Questions and Answers
- 1.What is the SI unit of momentum?
- A.
N*m
- B.
N/s
- C.
N*s
- D.
N/m
- 2.When a cannon fires a cannonball, the cannon will recoil backward because the
- A.
Energy of the cannonball and cannon is conserved.
- B.
Momentum of the cannonball and cannon is conserved.
- C.
Energy of the cannon is greater than the energy of the cannonball.
- D.
Momentum of the cannon is greater than the energy of the cannonball.
- 3.A freight car moves along a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car?
- A.
It increases.
- B.
It remains the same.
- C.
It decreases.
- D.
Cannot be determined from the information given.
- 4.A child falls sideways off a sled while sledding on frictionless ice. What happens to the velocity of the sled?
- A.
It increases.
- B.
It remains the same.
- C.
It decreases.
- D.
Cannot be determined from the information given.
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