Question 1

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

Accepted Answer

Natural motion occurs without external causes and strives to return objects to their 'proper place,' while violent motion is produced by external forces.

Question 2

Galileo's inclined plane experiments led to which important concept in physics?

Accepted Answer

The property of inertia.

Question 3

Which of the following best describes inertia?

Accepted Answer

A property of matter that resists changes in motion.

Question 4

A cart 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 cart?

Accepted Answer

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

Question 5

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 6

If two forces of $$8\ \mathrm{N}$$ and $$6\ \mathrm{N}$$ act in opposite directions on an object, what is the magnitude and direction of the net force?

Accepted Answer

$$2\ \mathrm{N} in $$the direction of the $$8\ \mathrm{N}$$ force

Question 7

A book rests on a table. Which force is responsible for supporting the book against gravity?

Accepted Answer

Support force (normal force)

Question 8

A hockey puck slides at constant speed on frictionless ice. Which statement is true?

Accepted Answer

It is in dynamic equilibrium.

Question 9

Which equation represents the equilibrium rule for forces acting on a non-accelerating object?

Accepted Answer

$$\sum F = 0$$

Question 10

You are riding in a car at a steady speed and toss a coin straight up. Where does the coin land and why?

Accepted Answer

In your hand, because the coin retains the car's horizontal velocity due to inertia.

Question 11

A box is pulled with $$5\ \mathrm{N} to $$the left and $$10\ \mathrm{N} to $$the right. What is the net force acting on the box?

Accepted Answer

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

Question 12

Which of the following is NOT a scalar quantity?

Accepted Answer

Acceleration

Question 13

If you stand with one foot on each of two bathroom scales and your weight is evenly distributed, what does each scale read?

Accepted Answer

Half your weight

Question 14

Which of the following statements about vectors is correct?

Accepted Answer

Vectors have both magnitude and direction.

Question 15

A crate is pushed at a steady speed in a straight line. If the friction force is $$75\ \mathrm{N}$$, how much force must you apply?

Accepted Answer

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

Question 16

Which of the following is an example of static equilibrium?

Accepted Answer

A crate at rest on a frictionless surface

Question 17

Which rule is used to find the resultant of two vectors that are not in the same or opposite direction?

Accepted Answer

Parallelogram rule

Question 18

If two forces act at right angles to each other, how do you find the magnitude of the resultant force?

Accepted Answer

Use the Pythagorean theorem: $$R = \sqrt{F_1$^2 + F_2$^2}$$

Question 19

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

Accepted Answer

An object continues in a state of rest or uniform motion unless acted on by a nonzero net force.

Question 20

Which of the following is true about the equilibrium rule?

Accepted Answer

It applies to vector quantities.

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

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