Question 1

Which of the following best describes Galileo's concept of inertia?

Accepted Answer

Inertia is the tendency of an object to resist changes in its motion, and it depends on the object's mass.

Question 2

A hockey puck slides across frictionless ice at a constant speed. According to Newton's First Law, what is the net force acting on the puck?

Accepted Answer

$$F_{	ext{net}} = 0$$

Question 3

A box is pulled to the right with a force of 15 N and to the left with a force of 20 N. What is the net force acting on the box?

Accepted Answer

$$5\ 	ext{N} to $$the left

Question 4

Which of the following is a vector quantity?

Accepted Answer

Force

Question 5

Two forces act on an object: one of $$30\ 	ext{N}$$ upward and one of $$40\ 	ext{N} to $$the right. What is the magnitude of the resultant force?

Accepted Answer

$$50\ 	ext{N}$$

Question 6

A book rests on a table. Which statement best describes the forces acting on the book?

Accepted Answer

The support force and the force of gravity are equal in magnitude and opposite in direction.

Question 7

You are standing on two bathroom scales with your weight evenly distributed. If your total weight is $$800\ 	ext{N}$$, what does each scale read?

Accepted Answer

$$400\ 	ext{N}$$

Question 8

A crate is pushed at a steady speed in a straight line across a floor. If the friction force is $$75\ 	ext{N}$$, how much force must you apply?

Accepted Answer

Equal to $$75\ 	ext{N}$$

Question 9

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium can be moving at constant velocity.

Question 10

A car is moving at a constant velocity. Which of the following must be true?

Accepted Answer

The net force on the car is zero.

Question 11

A person tosses a coin straight up while riding in a train moving at constant velocity. Where does the coin land?

Accepted Answer

In the person's hand

Question 12

Which of the following is NOT a property of a vector quantity?

Accepted Answer

It can only be positive.

Question 13

According to the parallelogram rule, when two vectors act at right angles, the magnitude of the resultant vector $$R is $$given by:

Accepted Answer

$$R = \sqrt{V^2$ + H^2$}$$

Question 14

Which of the following best explains why a book remains at rest on a table?

Accepted Answer

The net force acting on the book is zero.

Question 15

A painter stands on a platform supported by two ropes. If the sum of the upward forces from the ropes equals the sum of the downward forces from the painter and the platform, what is the state of the system?

Accepted Answer

The system is in equilibrium.

Question 16

Which of the following is a scalar quantity?

Accepted Answer

Mass

Question 17

If you push a box and it does not move, what can you conclude about the forces acting on it?

Accepted Answer

The applied force is equal and opposite to the friction force.

Question 18

Which of the following statements about support force (normal force) is correct?

Accepted Answer

It acts upward, opposing the force of gravity.

Question 19

A ball is rolling on a horizontal surface and comes to a stop. According to Galileo, what is the reason for the ball stopping?

Accepted Answer

A net force (such as friction) acts on the ball.

Question 20

Which of the following best describes the equilibrium rule in equation form?

Accepted Answer

$$\sum F = 0$$

Newton’s First Law of Motion—Inertia: Foundations, Forces, and Equilibrium

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