Question 1

Which of the following statements best describes Newton's First Law of Motion?

Accepted Answer

An object will remain at rest or move at constant velocity unless acted upon by a net external force.

Question 2

Which of the following is NOT a fundamental force of nature?

Accepted Answer

Friction

Question 3

A 2-kg ball is accelerating to the right at $$3\ \mathrm{m/s^2$}. $$What is the net force acting on the ball?

Accepted Answer

$$6\ \mathrm{N} to $$the right

Question 4

Which property of matter gives rise to inertia?

Accepted Answer

Mass

Question 5

Which of the following forces is always attractive and never repulsive?

Accepted Answer

Gravitational force

Question 6

A box is pulled by two ropes in different directions. What type of force is exerted by the ropes?

Accepted Answer

Tension force

Question 7

Which of the following best describes the normal force?

Accepted Answer

A force that acts perpendicular to surfaces, preventing objects from passing through each other

Question 8

If the net force on a 10-kg object is doubled, what happens to its acceleration?

Accepted Answer

It is doubled

Question 9

Which equation correctly represents Newton's Second Law of Motion?

Accepted Answer

$$F = m 	imes a$$

Question 10

A 5-kg block slides to the right, slowing down from $$2.0\ \mathrm{m/s} to$$ $$1.0\ \mathrm{m/s} in$$ $$1.0\ \mathrm{s}. $$What is the magnitude and direction of its acceleration?

Accepted Answer

$$-1.0\ \mathrm{m/s^2$}$$, to the left

Question 11

Which of the following is a secondary force that arises from electromagnetism and opposes motion along surfaces?

Accepted Answer

Friction

Question 12

Which force is responsible for binding protons together in the atomic nucleus?

Accepted Answer

Strong nuclear force

Question 13

What is the SI unit of force?

Accepted Answer

Newton

Question 14

Which of the following statements about mass and weight is correct?

Accepted Answer

Weight is the gravitational force acting on an object's mass.

Question 15

Which force is responsible for radioactive decay?

Accepted Answer

Weak nuclear force

Question 16

A car is moving at a constant velocity on a straight road. According to Newton's First Law, what can be said about the net force acting on the car?

Accepted Answer

The net force is zero.

Question 17

Which of the following best describes the direction of the gravitational force near Earth's surface?

Accepted Answer

It always points toward the center of the Earth.

Question 18

Which force has infinite range and is much stronger than gravity, but is responsible for most human-scale forces?

Accepted Answer

Electromagnetic force

Question 19

A spring is compressed and then released. What type of force is responsible for returning the spring to its original shape?

Accepted Answer

Elastic (spring) force

Question 20

Which of the following best explains why you feel pushed back in your seat when a train suddenly accelerates forward?

Accepted Answer

Your inertia resists the change in motion.

Introduction to Forces: Fundamental Concepts in Physics

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