10 Questions
| Total Attempts: 1002

Questions and Answers

- 1.Momentum means or is most associated with:
- A.
Inertia

- B.
Newton's second Law

- C.
Inertia in Motion

- D.
Impulse

- 2.What could be the momentum of a 1,300-kg car that moves at 4 m/s?
- A.
5,200 N

- B.
5,200 kg.m/s

- C.
52 kg.m/s

- D.
52 N

- 3.Will a large truck always have more momentum than a roller skate?
- A.
No, a large truck at rest has no momentum. A moving roller skate has momentum.

- B.
Yes, a large truck has greater mass than a a roller skate.

- 4.Why is falling on a floor with more give less dangerous than falling on a floor with less give?
- A.
Because the floor with more give allows a greater time for the impulse that reduces the momentum of fall to zero. A greater time for a change in momentum results in less force.

- B.
Because falling on a floor with more give causes less impact.

- C.
Because falling on a floor with more give includes greater momentum.

- D.
Because falling on a floor with less give comprises shorter time.

- 5.Read the following statement :"If no net force or net impulse acts on a system, the momentum of that system cannot change." What does it refer to?
- A.
Law of Impulse

- B.
Newton's 3rd Law

- C.
Law of Momentum

- D.
Law of Conservation of Momentum

- 6.Newton's second law states that of no net force is exerted on a system, no acceleration occurs. Does it follow that no change in momentum occurs?
- A.
No, other variables can lead to the change in speed other than acceleration.

- B.
Yes, because no acceleration means that no change occurs in velocity or in momentum.

- 7.A blue billiard ball is moving at speed "v" towards a red ball of the same mass standing still. Assuming it is an elastic collision, after hitting the red ball, the blue one:
- A.
Bounces back.

- B.
Stops.

- C.
Moves along with the red ball at half "v".

- D.
Moves along with the red ball at "v".

- 8.What impulse occurs when an average force of 15 N is exerted on a cart for 3.0 s?
- A.
55 N.s

- B.
50 N.s

- C.
45 N.s

- D.
40 N.s

- 9.Based on the problem above, if the mass of the cart is 5 kg and the cart is initially at rest, its final speed is equivalent to:
- A.
9 m/s

- B.
15 m/s

- C.
20 m/s

- D.
10 m/s

- 10.What is the average force that a gun exerts on a bullet shot with an impulse of 14,000 N.s? Assume it took 0.4 s for the bullet to leave the barrel.
- A.
5,600 N

- B.
35,000N

- C.
30,000 N

- D.
56,000N

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