14 Questions
| Attempts: 817

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Questions and Answers

- 1.When comparing the momentum of two moving objects, which of the following is correct?
- A.
The object with the higher velocity will have less momentum if the masses are equal.

- B.
The more massive object will have less momentum if its velocity is greater.

- C.
The less massive object will have less momentum if the velocities are the same.

- D.
The more massive object will have less momentum if the velocities are the same.

- 2.Two skaters stand facing each other. One skater’s mass is 60 kg, and the other’s mass is 72 kg. If the skaters push away from each other without spinning,
- A.
The lighter skater has less momentum.

- B.
Their momenta are equal but opposite.

- C.
Their total momentum doubles.

- D.
Their total momentum decreases.

- 3.In a two-body collision,
- A.
Momentum is always conserved.

- B.
Kinetic energy is always conserved.

- C.
Neither momentum nor kinetic energy is conserved.

- D.
Both momentum and kinetic energy are always conserved.

- 4.A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. The momentum of the chair
- A.
Was zero while stationary and increased when the person stood.

- B.
Was greatest while the person sat in the chair.

- C.
Remained the same.

- D.
Was zero when the person got out of the chair and increased while the person sat.

- 5.Two swimmers relax close together on air mattresses in a pool. One swimmer’s mass is 48 kg, and the other’s mass is 55 kg. If the swimmers push away from each other,
- A.
Their total momentum triples.

- B.
Their momenta are equal but opposite.

- C.
Their total momentum doubles.

- D.
Their total momentum decreases.

- 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.

- 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.

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

- 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.

- 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.

- 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.

- 11.A 6.0 x 10
^{-}^{2}kg tennis ball moves at a velocity of 12 m/s. The ball is struck by a racket, causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in the ball’s momentum?- A.
0.36 kg*m/s

- B.
0 kg*m/s

- C.
0.036 kg*m/s

- D.
1.8 kg*m/s

- 12.A student stumbles backward off a dock and lands in a small boat. The student isn't hurt, but the boat drifts away from the dock with a velocity of 0.85 m/s to the west. If the boat and student each have a mass of 68 kg, what is the student’s initial horizontal velocity?
- A.
0 m/s

- B.
57.8 m/s

- C.
0.85 m/s

- D.
1.7 m/s

- 13.A 20.0 kg cannonball is fired from a 2.40 x 10
^{3}kg. If the cannon recoils with a velocity of 3.5 m/s backwards, what is the velocity of the cannonball?- A.
420 m/s

- B.
48,000 m/s

- C.
9.81 m/s

- D.
137 m/s

- 14.A 50.0 g shell fired from a 3.00 kg rifle has a speed of 400.0 m/s. With what speed does the rifle recoil in the opposite direction?
- A.
6.67 m/s

- B.
6666.67 m/s

- C.
21200 m/s

- D.
1220 m/s

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