Question 1

A box with a weight of 75 N is at rest on a table, as shown in the first image. What is the magnitude and direction of the normal (support) force acting on the box?

Accepted Answer

75 N, upward

Question 2

Which of the following best describes the condition for an object to be in static equilibrium?

Accepted Answer

The net force acting on the object is zero: $$\Sigma F = 0$$

Question 3

A 6 kg box weighs 60 N on Earth. What would its weight be on the Moon, where $$g_{moon} = 1.67 \ \mathrm{m/s^2$}$$?

Accepted Answer

$$10 \ \mathrm{N}$$

Question 4

Which of the following statements about mass and weight is correct?

Accepted Answer

Mass is constant everywhere, but weight depends on the local gravitational field.

Question 5

A student pushes a box with a force of 20 N to the right. The maximum static friction between the box and the floor is 15 N. What is the net force on the box?

Accepted Answer

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

Question 6

Which equation correctly relates the coefficient of friction ($$\mu$$), the normal force ($$F_N$$), and the frictional force ($$F_f$$)?

Accepted Answer

$$F_f = \mu F_N$$

Question 7

Why does increasing the contact area between two surfaces NOT increase the frictional force if the weight is held constant?

Accepted Answer

Because the increase in area is exactly offset by the decrease in pressure, keeping friction constant.

Question 8

A car travels 20 m in 4 s at a constant speed. What is its average velocity?

Accepted Answer

$$5 \ \mathrm{m/s}$$

Question 9

Which of the following best describes the difference between speed and velocity?

Accepted Answer

Velocity includes direction, while speed does not.

Question 10

A ball is dropped from rest and falls freely under gravity. What is its velocity after 3 seconds? (Assume $$g = 10 \ \mathrm{m/s^2$})$$

Accepted Answer

$$30 \ \mathrm{m/s}$$ downward

Question 11

Which equation gives the distance fallen by an object starting from rest under constant acceleration $$a$$ after time $$t$$?

Accepted Answer

$$d = \frac{1}{2} a t^2$

Question 12

A car accelerates uniformly from rest at $$5 \ \mathrm{m/s^2$}. $$What is its velocity after 4 seconds?

Accepted Answer

$$20 \ \mathrm{m/s}$$

Question 13

Which of the following is an example of dynamic equilibrium?

Accepted Answer

A car moving at constant velocity on a straight, level road

Question 14

If the net force on an object is not zero, what must be true about the object's motion?

Accepted Answer

The object is accelerating.

Question 15

A 10 kg box is pulled with a force of 50 N to the right. The frictional force is 20 N to the left. What is the acceleration of the box?

Accepted Answer

$$3 \ \mathrm{m/s^2$}$$

Question 16

Which of the following best describes Galileo's contribution to the understanding of motion?

Accepted Answer

He introduced the concept of inertia and quantified motion using speed and acceleration.

Question 17

A book is sliding across a table and slows down to a stop. Which force is primarily responsible for this change in motion?

Accepted Answer

Kinetic friction

Question 18

If you are inside a ship moving at constant velocity and drop a coin, what will you observe?

Accepted Answer

The coin falls straight down relative to you.

Question 19

Which of the following is the correct formula for acceleration when an object starts from rest?

Accepted Answer

$$a = \frac{V_{final}}{t}$$

Patterns of Motion and Equilibrium: Foundations of Physics with Calculus

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