Question 1

Refer to the first image (filmstrip of a car moving past a tree). What type of motion does this sequence best represent?

Accepted Answer

The car is moving with constant speed.

Question 2

In the second image, the car is shown at equal distances apart in each frame, with equal time intervals between images. What does this indicate about the car's velocity?

Accepted Answer

The car's velocity is constant.

Question 3

In the third image, a skateboarder is shown at equally spaced positions in each frame. What can you conclude about the skateboarder's motion?

Accepted Answer

The skateboarder is moving at constant speed.

Question 4

The fourth image shows a stationary soccer ball. What is the average velocity of the ball?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 5

In the fifth image, a runner's positions are shown at increasing distances apart in each frame. What does this indicate about the runner's acceleration?

Accepted Answer

The runner is accelerating.

Question 6

In the sixth image, the distance between the cars increases with each frame. What does this tell you about the motion of the car?

Accepted Answer

The car is accelerating.

Question 7

The seventh image shows a basketball following a curved path into a hoop. Which of the following best describes the ball's motion?

Accepted Answer

The ball's velocity and acceleration both change direction.

Question 8

In the eighth and ninth images, two cars (A and B) are shown in motion diagrams. If the time interval between each image is the same, which car is moving slower?

Accepted Answer

Car A is moving slower.

Question 9

The tenth image shows a motion diagram of a car stopping. What does the decreasing distance between the dots represent?

Accepted Answer

The car is slowing down (decelerating).

Question 10

The eleventh image shows a motion diagram of a rocket launch. What does the increasing distance between the dots represent?

Accepted Answer

The rocket is accelerating upward.

Question 11

In the twelfth and thirteenth images, three motion diagrams (a, b, c) are shown. Which diagram best represents a dust particle settling to the floor at constant speed?

Accepted Answer

(a)

Question 12

In the same set of diagrams, which one best represents a ball dropped from the roof of a building?

Accepted Answer

(b)

Question 13

In the same set of diagrams, which one best represents a descending rocket slowing to make a soft landing on Mars?

Accepted Answer

(c)

Question 14

Refer to the fourteenth image (basketball trajectory with coordinates). What is the displacement of the ball from $$t = 0 to$$ $$t = 2.5\ \mathrm{s}$$?

Accepted Answer

$$\sqrt{(15^2$ + 6^2$)}\ \mathrm{m}$$

Question 15

The fifteenth image shows a position vs. time graph with a horizontal line. What does this graph represent?

Accepted Answer

An object at rest.

Question 16

If an object moves in a straight line and returns to its starting point, which of the following is true?

Accepted Answer

Distance is nonzero, displacement is zero.

Question 17

A car travels around a circular track of diameter $$40\ \mathrm{m}$$ for $$2.5$$ laps. What is the displacement of the car?

Accepted Answer

$$40\ \mathrm{m}$$

Question 18

A 747 airliner reaches its takeoff speed of $$180\ \mathrm{mi/hr} in$$ $$30\ \mathrm{s}. $$What is its average acceleration in $$\mathrm{mi/hr/s}$$?

Accepted Answer

$$6\ \mathrm{mi/hr/s}$$

Question 19

If the position of a particle is given by $$x(t) = 1.0 + 2.0t - 1.5t^2$, what is the instantaneous velocity at t = 2.0$$\ \mathrm{s}$$?

Accepted Answer

$$v = 2.0 - 3.0(2.0) = -4.0\ \mathrm{m/s}$$

1D Kinematics: Concepts, Motion Diagrams, and Graphical Analysis

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