Question 1

According to Newton's First Law of Motion, what will happen to an object moving in a straight line at constant speed if no net force acts on it?

Accepted Answer

It will continue moving in a straight line at constant speed.

Question 2

Which of the following best describes inertia as defined by Galileo?

Accepted Answer

A property of all matter to resist changes in motion.

Question 3

A hockey puck slides at constant velocity on frictionless ice. Which statement is true according to Newton's First Law?

Accepted Answer

It is in dynamic equilibrium.

Question 4

A crate is pushed across a floor at a steady speed. If the friction force is $$75\ \mathrm{N}$$, how much force must you apply to keep it moving at constant speed?

Accepted Answer

$$75\ \mathrm{N}$$

Question 5

If the gravitational force between the Sun and Earth suddenly disappeared, what would happen to Earth's motion?

Accepted Answer

It would continue moving in a straight-line path.

Question 6

Which of the following is a vector quantity?

Accepted Answer

Force

Question 7

A cart is pulled to the right with a force of $$15\ \mathrm{N}$$ and to the left with a force of $$20\ \mathrm{N}. $$What is the net force on the cart?

Accepted Answer

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

Question 8

Which scenario best illustrates static equilibrium?

Accepted Answer

A book resting on a table.

Question 9

A person stands with one foot on each of two bathroom scales, distributing their weight evenly. If their total weight is $$800\ \mathrm{N}$$, what does each scale read?

Accepted Answer

$$400\ \mathrm{N}$$

Question 10

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium can be moving at constant velocity.

Question 11

Which of the following is NOT a scalar quantity?

Accepted Answer

Velocity

Question 12

A bag of flour is suspended by a rope. The upward force in the rope is $$50\ \mathrm{N}$$, and the downward force due to gravity is $$50\ \mathrm{N}. $$What is the net force on the bag?

Accepted Answer

$$0\ \mathrm{N}$$

Question 13

Which of the following best describes the support (normal) force?

Accepted Answer

A force that acts perpendicular to the force of gravity.

Question 14

Which experiment by Galileo helped disprove Aristotle's assertion that heavier objects fall faster than lighter ones?

Accepted Answer

Dropping objects of different weights from the Leaning Tower of Pisa.

Question 15

A ball is at rest in the middle of a cart. If you quickly jerk the cart forward, what happens to the ball?

Accepted Answer

It moves to the back of the cart.

Question 16

Which of the following is an example of dynamic equilibrium?

Accepted Answer

A hockey puck sliding at constant speed on ice.

Question 17

If the sum of all forces acting on an object is zero, what can be said about the object's motion?

Accepted Answer

It could be at rest or moving at constant velocity.

Question 18

Which of the following best describes Aristotle's view of motion for objects not in their 'proper place'?

Accepted Answer

They strive to reach their proper place.

Question 19

Which of the following is a correct application of the equilibrium rule $$\sum \vec{F} = 0$$?

Accepted Answer

A person standing still on the ground.

Question 20

Which of the following statements about friction is correct?

Accepted Answer

Friction opposes the motion of objects.

Newton’s First Law of Motion and the Concept of Inertia: Foundations and Historical Context

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