Question 1

According to Galileo's Leaning Tower of Pisa experiment, what happens when two objects of different weights are dropped from the same height at the same time, assuming air resistance is negligible?

Accepted Answer

Both objects land at the same time.

Question 2

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

Accepted Answer

An object will remain at rest or move in a straight line at constant speed unless acted on by a nonzero net force.

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

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

Question 4

Which of the following is a vector quantity?

Accepted Answer

Force

Question 5

A cart is pulled east with $$10\ \mathrm{N}$$ and north with $$10\ \mathrm{N}. $$What is the magnitude of the resultant force?

Accepted Answer

$$\sqrt{10^2$ + 10^2$} = 14.1\ \mathrm{N}$$

Question 6

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium has a net force of zero.

Question 7

You stand with one foot on each of two bathroom scales, distributing your weight evenly. If your weight is $$600\ \mathrm{N}$$, what does each scale read?

Accepted Answer

$$300\ \mathrm{N}$$

Question 8

A crate is pushed at a steady speed in a straight line. If the friction force is $$75\ \mathrm{N}$$, what is the magnitude of the applied force?

Accepted Answer

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

Question 9

Which of the following is NOT a type of force discussed in the chapter?

Accepted Answer

Acceleration

Question 10

A bowling ball is in equilibrium when it:

Accepted Answer

Both of the above.

Question 11

If you toss a coin straight up while riding in a train moving at constant velocity, where will the coin land?

Accepted Answer

In your hand.

Question 12

Which of the following best describes inertia?

Accepted Answer

A property of matter to resist changes in motion.

Question 13

A $$5\ \mathrm{kg}$$ object is acted on by two forces: $$8\ \mathrm{N} to $$the right and $$3\ \mathrm{N} to $$the left. What is the net force and direction?

Accepted Answer

$$5\ \mathrm{N} to $$the right

Question 14

Which of the following is a scalar quantity?

Accepted Answer

Mass

Question 15

A $$30\ \mathrm{N}$$ force acts north and a $$40\ \mathrm{N}$$ force acts east on an object. What is the magnitude of the resultant force?

Accepted Answer

$$50\ \mathrm{N}$$

Question 16

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

Accepted Answer

It is always perpendicular to the surface of contact.

Question 17

A book rests on a table. Which forces are acting on the book?

Accepted Answer

Both the force of gravity and the support force.

Question 18

Which of the following best describes dynamic equilibrium?

Accepted Answer

An object moving at constant speed in a straight line with no net force.

Question 19

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

Accepted Answer

The object is moving at constant velocity or at rest.

Question 20

Which scientist first proposed that objects of different weights fall at the same rate in the absence of air resistance?

Accepted Answer

Galileo

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

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