Question 1

According to Aristotle, what is the primary difference between 'natural motion' and 'violent motion'?

Accepted Answer

Natural motion is the movement of objects to their 'proper place' without external influence, while violent motion is produced by external pushes or pulls.

Question 2

Galileo's inclined plane experiments led to the discovery of which fundamental property of matter?

Accepted Answer

Inertia

Question 3

Which of the following best describes inertia?

Accepted Answer

A property of matter that resists changes in motion

Question 4

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

Accepted Answer

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

Question 5

A box 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 acting on the box?

Accepted Answer

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

Question 6

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 7

Two forces, $$F_1 = 8$$\ \mathrm{N}$$ east and F_2$ = 6\ \mathrm{N}$$ west, act on an object. What is the magnitude and direction of the net force?

Accepted Answer

$$2\ \mathrm{N}$$ east

Question 8

A $$5\ \mathrm{kg}$$ object is at rest on a table. The force of gravity on the object is $$49\ \mathrm{N}$$ downward. What is the magnitude of the support force (normal force) provided by the table?

Accepted Answer

$$49\ \mathrm{N}$$

Question 9

You are standing in an elevator that is moving upward at a constant speed. Which statement is true about the forces acting on you?

Accepted Answer

The upward support force is equal to your weight.

Question 10

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

Accepted Answer

$$75\ \mathrm{N}$$

Question 11

Which of the following scenarios best illustrates dynamic equilibrium?

Accepted Answer

A hockey puck sliding at constant speed on ice

Question 12

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

Accepted Answer

$$400\ \mathrm{N}$$

Question 13

Which equation correctly expresses the equilibrium rule for forces acting on an object?

Accepted Answer

$$\sum F = 0$$

Question 14

A $$3\ \mathrm{kg}$$ object is suspended by two ropes at different angles. The tensions in the ropes add vectorially to support the object's weight. If the weight is $$29.4\ \mathrm{N}$$, what must be true about the vector sum of the tensions?

Accepted Answer

The vector sum is equal to $$29.4\ \mathrm{N}$$ and points upward

Question 15

You are riding in a car moving at a constant velocity and toss a coin straight up. Where does the coin land?

Accepted Answer

In your hand

Question 16

Which of the following statements about equilibrium is correct?

Accepted Answer

An object in equilibrium can be moving at constant velocity.

Question 17

A $$10\ \mathrm{N}$$ force acts north and a $$10\ \mathrm{N}$$ force acts east on an object. What is the magnitude of the resultant force?

Accepted Answer

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

Question 18

Which of the following is NOT a scalar quantity?

Accepted Answer

Force

Question 19

If a ball rolling on a horizontal surface eventually comes to rest, what is the most accurate explanation according to Galileo?

Accepted Answer

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

Question 20

Which of the following best describes the support force (normal force) acting on a book resting on a table?

Accepted Answer

It is an upward force equal in magnitude to the book's weight.

Newton’s First Law of Motion and Inertia: Foundations and Applications

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