Question 1

Which of the following statements best describes Galileo's discovery about falling objects in the absence of air resistance?

Accepted Answer

Objects of different weights fall at the same rate.

Question 2

A hockey puck slides at constant speed on frictionless ice. Which concept does this scenario best illustrate?

Accepted Answer

Dynamic equilibrium

Question 3

If the net force acting on an object is doubled, what happens to its acceleration according to Newton's Second Law?

Accepted Answer

Acceleration is doubled.

Question 4

Which formula correctly expresses the relationship between force, mass, and acceleration?

Accepted Answer

$$ F = m 	imes a $$

Question 5

A skydiver jumps from a plane and eventually reaches terminal velocity. What is true at terminal velocity?

Accepted Answer

The force of gravity equals the force of air resistance.

Question 6

If you double the speed of an object, by what factor does its kinetic energy increase?

Accepted Answer

It quadruples.

Question 7

Which equation gives the potential energy of an object of mass $$ m  at $$height $$ h $$ above the ground?

Accepted Answer

$$ PE = m 	imes g 	imes h $$

Question 8

A lever allows a small force to move a large object by:

Accepted Answer

Increasing the distance over which the force is applied.

Question 9

According to the Universal Law of Gravity, if the distance between two masses is doubled, what happens to the gravitational force between them?

Accepted Answer

It is reduced to one-fourth.

Question 10

Which formula represents the gravitational force between two masses $$ m_1$ $$ and $$ m_2$ $$ separated by distance $$ d $$?

Accepted Answer

$$ F = G \frac{m_1$ m_2$}{d^2$} $$

Question 11

A car pushes against the road, and the road pushes back against the tires. This is an example of:

Accepted Answer

Action-reaction forces (Newton's Third Law)

Question 12

Which of the following best describes static equilibrium?

Accepted Answer

An object at rest with no net force acting on it.

Question 13

If the same force is applied to two objects, one with mass $$ m $$ and one with mass $$ 2m $$, how do their accelerations compare?

Accepted Answer

The object with mass $$ m $$ accelerates twice as much as the object with mass $$ 2m .$$

Question 14

Which of the following is true about the gravitational field inside a planet?

Accepted Answer

It decreases to zero at the center.

Question 15

A stretched rubber band has stored energy that can do work. This is an example of:

Accepted Answer

Potential energy

Question 16

Which equation correctly gives the work done by a force $$ F $$ over a distance $$ d $$?

Accepted Answer

$$ W = F 	imes d $$

Question 17

A person stands on a scale in an elevator accelerating upward. What happens to the reading on the scale?

Accepted Answer

It increases.

Question 18

Which of the following best describes the concept of inertia?

Accepted Answer

The tendency of an object to resist changes in its motion.

Question 19

A ball is dropped from rest. What is the distance it falls after 3 seconds, assuming $$ g = 10 	ext{ m/s}^2 $$ and no air resistance?

Accepted Answer

$$ 60 	ext{ m} $$

Question 20

Which of the following is a correct statement about energy?

Accepted Answer

Energy is a conserved quantity.

Chapter 2: Inertia and the Foundations of Classical Mechanics

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