Question 1

According to Galileo's experiments, what happens when two objects of different weights are dropped from the same height in the absence of air resistance?

Accepted Answer

Both objects fall at the same rate and hit the ground simultaneously.

Question 2

Which of the following best describes inertia?

Accepted Answer

The property of matter to resist changes in its motion.

Question 3

A crate is pushed across a floor at a constant velocity. Which statement about the forces acting on the crate is correct?

Accepted Answer

The applied force is equal to the frictional force.

Question 4

Which equation represents the equilibrium rule for forces acting on a nonaccelerating object?

Accepted Answer

$$\sum F = 0$$

Question 5

A skydiver reaches terminal velocity during free fall. What does this mean in terms of forces acting on the skydiver?

Accepted Answer

The force of gravity is equal to air resistance, resulting in zero net force.

Question 6

Which of the following statements is consistent with Newton's First Law of Motion?

Accepted Answer

An object at rest remains at rest, and an object in motion remains in motion at constant velocity unless acted upon by a nonzero net force.

Question 7

A hockey puck slides across ice at constant velocity. What type of equilibrium is this an example of?

Accepted Answer

Dynamic equilibrium

Question 8

If the net force acting on an object is zero, which of the following must be true?

Accepted Answer

The object is moving at a constant velocity or is at rest.

Question 9

Which SI unit is used to measure force?

Accepted Answer

Newton (N)

Question 10

A ball is rolled up an incline and then allowed to roll down the other side. According to Galileo, what will happen to the ball if there is no friction?

Accepted Answer

It will roll down and reach the same height as its starting point.

Question 11

Which of the following best describes the concept of net force?

Accepted Answer

The combination of all forces acting on an object.

Question 12

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

Accepted Answer

Directly back into the person's hand.

Question 13

Which of the following is NOT a correct example of static equilibrium?

Accepted Answer

A car moving at constant velocity.

Question 14

Which statement about horizontal motion is correct according to Galileo's findings?

Accepted Answer

Horizontal motion continues at constant speed unless acted upon by a force.

Question 15

A box is at rest on a table. The table exerts an upward force on the box. What is this force called?

Accepted Answer

Support force (normal force)

Question 16

Which of the following scenarios best illustrates dynamic equilibrium?

Accepted Answer

A skydiver falling at terminal velocity.

Question 17

If a net force of $$10\ \mathrm{N} is $$applied to a $$2\ \mathrm{kg}$$ object, what is its acceleration?

Accepted Answer

$$5\ \mathrm{m/s^2$}$$

Question 18

Which of the following is a correct statement about the support force on an object at rest on a surface?

Accepted Answer

It is equal to the object's weight.

Question 19

A crate is pushed at a steady speed across a rough floor. What can be said about the forces acting on the crate?

Accepted Answer

The applied force is equal to the frictional force.

Question 20

Which of the following best explains why a moving object continues in motion at constant velocity unless acted upon by a net force?

Accepted Answer

Because of inertia.

Newton's First Law of Motion: Inertia, Forces, and Historical Foundations

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