Question 1

Which of the following best describes the law of conservation of momentum in a closed system?

Accepted Answer

The total momentum before an interaction is equal to the total momentum after the interaction.

Question 2

A 2 kg object moving at $$4 \, \mathrm{m/s}$$ collides with a stationary 1 kg object. If they stick together after the collision, what is their final velocity?

Accepted Answer

$$2.67 \, \mathrm{m/s}$$

Question 3

Which equation correctly expresses the impulse-momentum theorem?

Accepted Answer

$$F \Delta t = m \Delta v$$

Question 4

A 100 kg astronaut floating in space throws a 2 kg wrench at $$10 \, \mathrm{m/s}$$ away from himself. What is the astronaut's velocity after throwing the wrench?

Accepted Answer

$$-0.2 \, \mathrm{m/s}$$

Question 5

Which of the following is a vector quantity?

Accepted Answer

Momentum

Question 6

If a force of $$10 \, \mathrm{N}$$ acts on a $$2 \, \mathrm{kg}$$ object for $$5 \, \mathrm{s}$$, what is the change in velocity of the object?

Accepted Answer

$$5 \, \mathrm{m/s}$$

Question 7

A $$1 \, \mathrm{kg}$$ ball moving at $$3 \, \mathrm{m/s}$$ collides elastically with a $$2 \, \mathrm{kg}$$ ball at rest. What is the velocity of the $$1 \, \mathrm{kg}$$ ball after the collision?

Accepted Answer

$$-1 \, \mathrm{m/s}$$

Question 8

Which of the following scenarios best illustrates an inelastic collision?

Accepted Answer

Two cars crash and stick together, moving as one mass after the collision.

Question 9

If the net external force on a system is zero, what can be said about the system's total momentum?

Accepted Answer

It remains constant.

Question 10

A $$0.5 \, \mathrm{kg}$$ ball moving at $$6 \, \mathrm{m/s}$$ collides with a $$1.5 \, \mathrm{kg}$$ ball at rest. If they stick together, what is their final velocity?

Accepted Answer

$$1.5 \, \mathrm{m/s}$$

Question 11

Which of the following is the correct formula for momentum?

Accepted Answer

$$p = m v$$

Question 12

A $$3 \, \mathrm{kg}$$ object moving at $$2 \, \mathrm{m/s}$$ collides with a $$2 \, \mathrm{kg}$$ object moving at $$-1 \, \mathrm{m/s}. $$What is the total momentum before the collision?

Accepted Answer

$$4 \, \mathrm{kg \cdot m/s}$$

Question 13

Which of the following best describes impulse?

Accepted Answer

The product of force and the time interval over which it acts.

Question 14

A $$2 \, \mathrm{kg}$$ cart moving at $$3 \, \mathrm{m/s}$$ collides with a $$1 \, \mathrm{kg}$$ cart at rest. If the collision is perfectly elastic, what is the velocity of the $$1 \, \mathrm{kg}$$ cart after the collision?

Accepted Answer

$$4 \, \mathrm{m/s}$$

Question 15

Which of the following is NOT a requirement for the conservation of momentum to apply?

Accepted Answer

The collision must be elastic.

Question 16

A force of $$8 \, \mathrm{N}$$ acts on a $$4 \, \mathrm{kg}$$ object for $$2 \, \mathrm{s}. $$What is the impulse delivered to the object?

Accepted Answer

$$16 \, \mathrm{N \cdot s}$$

Momentum, Impulse, and Conservation of Momentum – Study Notes

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