Question 1

A boulder rolling down a hill (as shown in the first image) has which of the following properties?

Accepted Answer

Momentum, energy, and speed

Question 2

If you push a car (as shown in the second image) and it starts to move, what is required for its momentum to change?

Accepted Answer

An external force must be applied

Question 3

A golfer follows through with a swing (as in the third image) to maximize the change in the ball's momentum. This is because:

Accepted Answer

Increasing the time of contact increases the impulse

Question 4

A baseball player follows through after hitting the ball (as shown in the fourth image). What is the main physics reason for this?

Accepted Answer

To increase the time of contact and thus the impulse

Question 5

A truck crashes into a haystack versus a wall (as in the fifth image). Both experience the same change in momentum, but the force is less when hitting the haystack because:

Accepted Answer

The time of momentum change is longer

Question 6

In boxing (as shown in the sixth image), why is it safer to 'ride with the punch'?

Accepted Answer

It increases the time over which momentum is reduced, decreasing the force

Question 7

A karate expert breaks a stack of bricks (as in the seventh image) by moving her arm quickly. Why is the force of impact so large?

Accepted Answer

The time interval of contact is very short

Question 8

When a cannon is fired (as in the eighth image), why does the cannon recoil?

Accepted Answer

Momentum is conserved; the cannonball and cannon move in opposite directions

Question 9

In a collision where two identical freight cars couple together (as in the eleventh image), what happens to the speed of the coupled cars compared to the initial speed of the moving car?

Accepted Answer

It is half the initial speed

Question 10

A weightlifter raises a barbell twice as heavy the same distance (as in the twelfth image). How much work is done compared to lifting the original barbell?

Accepted Answer

Twice as much

Question 11

If you push against a stationary wall for several minutes (as in the thirteenth image), how much work do you do on the wall?

Accepted Answer

Zero

Question 12

A car is hoisted for repairs in a service station (as in the fifteenth image). What happens to its gravitational potential energy relative to the floor?

Accepted Answer

It increases

Question 13

A ball is raised to a height of 3 meters by three different paths (as in the eighteenth image). The potential energy gained by the ball depends on:

Accepted Answer

Only the vertical height

Question 14

A car with momentum must also have:

Accepted Answer

Kinetic energy

Question 15

If the speed of a car is doubled, how does its kinetic energy change?

Accepted Answer

It quadruples

Question 16

Suppose the potential energy of a drawn bow is 50 J and the kinetic energy of the shot arrow is 40 J (as in the twenty-second image). What happened to the remaining energy?

Accepted Answer

10 J went to warming the bow

Question 17

A worker runs up the stairs quickly, while another climbs slowly (as in the twenty-fourth image). Both do the same amount of work, but the one who runs uses more:

Accepted Answer

Power

Question 18

Which equation best describes the work done in stopping a moving crate sliding across a floor?

Accepted Answer

$$Fd = \Delta \left( \frac{1}{2}mv^2$ \right)$$

Question 19

If the initial speed of a car is doubled, the stopping distance required (assuming constant braking force) is:

Accepted Answer

Four times as great

Momentum, Impulse, Work, Energy, and Power: Core Concepts in Physics

Study Guide - Practice Questions

Study Guide - Flashcards