Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is a measure of inertia and does not depend on location, while weight is the gravitational force and depends on location.

Question 2

A 70-kg astronaut is standing on the Moon, where the acceleration due to gravity is $$1.62\ \mathrm{m/s^2$}. $$What is the astronaut's weight on the Moon?

Accepted Answer

$$113.4\ \mathrm{N}$$

Question 3

A book rests on a table. Which of the following forces act on the book? Select all that apply.

Accepted Answer

Weight due to gravity

Question 4

A skier is sliding down a snowy ramp. Which forces should be included in the free-body diagram of the skier? Select all that apply.

Accepted Answer

Normal force

Question 5

A 50-kg student stands on a scale in a freely falling elevator. What does the scale read?

Accepted Answer

$$0\ \mathrm{N}$$

Question 6

A block is pushed across a frictionless table by a hand. According to Newton's third law, which of the following is the correct action-reaction pair?

Accepted Answer

The force of the hand on the block and the force of the block on the hand

Question 7

A truck suddenly stops, causing a large rock in its bed to crash into the cab. Which concept best explains why the rock moves forward?

Accepted Answer

Inertia

Question 8

A person tries to get ketchup out of a bottle by shaking it downward. Which physics concept is being used?

Accepted Answer

Inertia

Question 9

A ski jumper is in the air after leaving the ramp. Which forces act on the jumper?

Accepted Answer

Weight and drag

Question 10

A block of mass $$m is at $$rest on a horizontal surface. Which equation correctly represents the equilibrium condition in the vertical direction?

Accepted Answer

$$n - mg = 0$$

Question 11

A 10-kg box is pulled horizontally with a net force of $$20\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$2\ \mathrm{m/s^2$}$$

Question 12

A person throws a boot while standing on frictionless ice to move toward the shore. In which direction should the boot be thrown?

Accepted Answer

Away from the shore

Question 13

A block is at rest on a ramp inclined at $$30^\circ. If $$the gravitational force on the block is $$13.2\ \mathrm{N}$$, what is the magnitude of the normal force exerted by the ramp?

Accepted Answer

$$13.2 \cos 30^\circ$$

Question 14

Which of the following statements about Newton's third law is correct?

Accepted Answer

Action and reaction forces always act on different objects.

Question 15

A person stands on a scale in an elevator that is descending and coming to a stop. How does the scale reading compare to the person's weight?

Accepted Answer

The reading is less than the person's weight.

Question 16

A block of mass $$m is $$pulled by a force $$F on a $$frictionless surface. If a second block of mass $$m is $$attached to the first, what happens to the acceleration of the system if the same force $$F is $$applied?

Accepted Answer

The acceleration is halved.

Question 17

A person slaps another person. According to Newton's third law, what happens?

Accepted Answer

The force on the slapper's hand is equal in magnitude and opposite in direction to the force on the other person's face.

Question 18

A block is at rest on a horizontal surface. Which of the following is true about the forces acting on the block?

Accepted Answer

The normal force and the weight are equal in magnitude and opposite in direction.

Question 19

A 5-kg object is acted on by two forces: $$10\ \mathrm{N} to $$the right and $$5\ \mathrm{N} to $$the left. What is the acceleration of the object?

Accepted Answer

$$1\ \mathrm{m/s^2$}$$\ to\ the\ right$

Question 20

Which of the following is NOT a contact force?

Accepted Answer

Weight

Forces and Newton's Laws: Structured Study Notes for Physics with Calculus

Study Guide - Practice Questions

Study Guide - Flashcards