Question 1

Which of the following best describes the momentum $$\vec{p} of an $$object with mass $$m$$ and velocity $$\vec{v}$$?

Accepted Answer

$$\vec{p} = m \vec{v}$$

Question 2

A 2 kg cart moves at 3 m/s to the right. What is its momentum?

Accepted Answer

$$6\ \mathrm{kg\ m/s}$$\ to\ the\ right$

Question 3

Which of the following statements about momentum is correct?

Accepted Answer

Momentum is a vector quantity and is always parallel to velocity.

Question 4

A 0.5 kg object starts from rest and is subjected to a net force that varies with time, resulting in a total impulse of $$18\ \mathrm{N\ s}. $$What is its final velocity?

Accepted Answer

$$36\ \mathrm{m/s}$$

Question 5

Which equation correctly expresses the Impulse-Momentum Theorem?

Accepted Answer

$$\vec{J} = \int \vec{F}_{net} dt = \Delta \vec{p}$$

Question 6

A 0.375 kg rubber ball traveling at $$10\ \mathrm{m/s} to $$the right hits a wall and bounces back at $$6\ \mathrm{m/s} to $$the left. What is the total impulse exerted by the wall on the ball?

Accepted Answer

$$+6.0\ \mathrm{N\ s}$$

Question 7

Which of the following is a correct way to write Newton's Second Law in terms of momentum?

Accepted Answer

$$\sum \vec{F} = \frac{d\vec{p}}{dt}$$

Question 8

If a net force acts on an object for a certain time interval, which quantity does the area under the force vs. time graph represent?

Accepted Answer

Impulse

Question 9

A 1 kg cart is moving at $$2\ \mathrm{m/s} to $$the right. A net force acts to the left for $$3\ \mathrm{s}$$, bringing it to rest. What is the magnitude of the average force applied?

Accepted Answer

$$0.67\ \mathrm{N}$$

Question 10

Which of the following is NOT a property of an inertial reference frame?

Accepted Answer

It is accelerating or rotating.

Question 11

According to Einstein's Special Theory of Relativity, which statement is true?

Accepted Answer

The speed of light is constant in all inertial frames.

Question 12

Which experiment provided strong evidence that the speed of light is independent of the motion of the source and detector?

Accepted Answer

Michelson-Morley experiment

Question 13

Which of the following best describes the change in momentum $$\Delta \vec{p}$$ for an object of mass $$m$$ with initial velocity $$\vec{v}_{initial}$$ and final velocity $$\vec{v}_{final}$$?

Accepted Answer

$$\Delta \vec{p} = m (\vec{v}_{final} - \vec{v}_{initial})$$

Question 14

A force acts on a 0.2 kg hockey puck for 0.5 s, changing its velocity from $$4\ \mathrm{m/s} to$$ $$-2\ \mathrm{m/s}. $$What is the magnitude of the average force applied?

Accepted Answer

$$2.4\ \mathrm{N}$$

Question 15

Which of the following is the correct relativistic expression for momentum according to Einstein's correction?

Accepted Answer

$$\vec{p} = \frac{m \vec{v}}{\sqrt{1 - \frac{v^2$}{c^2$}}}$$

Question 16

A cart of mass 0.8 kg is initially at rest. A constant force of 2 N is applied for 3 seconds. What is the final velocity of the cart?

Accepted Answer

$$7.5\ \mathrm{m/s}$$

Question 17

Which of the following is a correct unit for impulse?

Accepted Answer

$$\mathrm{kg\ m/s}$$

Question 18

A 0.5 kg ball moving at $$8\ \mathrm{m/s} to $$the right is stopped by a wall in $$0.2\ \mathrm{s}. $$What is the magnitude of the average force exerted by the wall?

Accepted Answer

$$20\ \mathrm{N}$$

Impulse and Momentum: Physics I Study Notes

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학습 가이드 - 플래시카드