Question 1

Which of the following statements best describes the difference between kinematics and dynamics in physics?

Accepted Answer

Kinematics describes motion without considering its causes, while dynamics explains the reasons behind motion.

Question 2

A motion diagram shows a series of equally spaced images of a skateboarder rolling down a straight path. What does this indicate about the skateboarder's motion?

Accepted Answer

The skateboarder is moving with constant speed.

Question 3

An object moves from position $$x_1 = 2$$\ \mathrm{m}$$ at t_1$ = 0\ \mathrm{s} to$$ $$x_2 = -3$$\ \mathrm{m}$$ at t_2$ = 4\ \mathrm{s}. $$What is the displacement of the object?

Accepted Answer

$$-5\ \mathrm{m}$$

Question 4

A car travels from $$x = 0\ \mathrm{m} to$$ $$x = 10\ \mathrm{m}$$, then reverses and travels to $$x = -5\ \mathrm{m}. $$What is the total distance traveled and the displacement?

Accepted Answer

Distance: $$15\ \mathrm{m}$$, Displacement: $$-5\ \mathrm{m}$$

Question 5

Which of the following is true about displacement?

Accepted Answer

Displacement depends only on the initial and final positions.

Question 6

A runner moves from $$x = 1\ \mathrm{m} to$$ $$x = 4\ \mathrm{m} in$$ $$2\ \mathrm{s}$$, then turns around and moves to $$x = -1\ \mathrm{m} in$$ $$2\ \mathrm{s}. $$What is the average velocity over the $$4\ \mathrm{s}$$ interval?

Accepted Answer

$$-0.5\ \mathrm{m/s}$$

Question 7

Which equation correctly defines average acceleration $$a_{avg}$$?

Accepted Answer

$$a_{avg} = \frac{v_f - v_i}{\Delta t}$$

Question 8

A cyclist is moving at $$20\ \mathrm{m/s}$$ and comes to a stop in $$4\ \mathrm{s}. $$What is the average acceleration?

Accepted Answer

$$-5\ \mathrm{m/s^2$}$$

Question 9

If an object’s velocity and acceleration vectors point in opposite directions, what is happening to the object?

Accepted Answer

It is slowing down.

Question 10

A ball is dropped from a building and falls straight down. Which representation best describes its motion?

Accepted Answer

Motion diagram with increasing distance between images.

Question 11

Which of the following is NOT a valid way to represent motion in physics?

Accepted Answer

Verbal representation only, without any symbols or diagrams

Question 12

A particle is moving to the left and slowing down. What are the signs of its velocity and acceleration?

Accepted Answer

Velocity is negative, acceleration is positive.

Question 13

Which of the following best describes the position vector $$\vec{r}$$?

Accepted Answer

It points from the origin to the object's position and has both magnitude and direction.

Question 14

A car moves at constant velocity. What can be said about its acceleration?

Accepted Answer

Acceleration is zero.

Question 15

Which of the following quantities is a vector?

Accepted Answer

Displacement

Question 16

A motion diagram shows images of a rocket descending with decreasing distance between each image. What does this indicate?

Accepted Answer

The rocket is slowing down.

Question 17

If a graph of $$x$$ versus $$t$$ for an object is a straight line with positive slope, what does this indicate about the object's motion?

Accepted Answer

The object is moving at constant velocity to the right.

Question 18

A ball is thrown straight up. At the highest point, what is true about its velocity and acceleration?

Accepted Answer

Velocity is zero, acceleration is negative.

Question 19

Which of the following best describes average speed?

Accepted Answer

Average speed is the total distance traveled divided by the total time.

Question 20

A person walks $$3\ \mathrm{m}$$ east, then $$4\ \mathrm{m}$$ north. What is the magnitude of their displacement?

Accepted Answer

$$5\ \mathrm{m}$$

Kinematics: The Study of Motion in Physics

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