Name:    Test: Linear Motion

Multiple Choice
Identify the choice that best completes the statement or answers the question.  Make sure you bubble you answer sheet completely.  Do not write on this test.  Do all of your scratch work in the space provided on the bottom of you answer
sheet.

1

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by
 a. a rate that depends on its initial speed. b. a variable amount. c. about 15 m/s. d. about 10 m/s. e. about 5 m/s.

2

Speed is
 a. always measured in terms of a unit of distance divided by a unit of time. b. a measure of how fast something is moving. c. the distance covered per unit time. d. all of the above. e. none of the above.

3

Suppose you take a trip that covers 240 km and takes 6 hours to make. Your average speed is
 a. 40 km/h. b. 20 km/h. c. 480 km/h. d. 240 km/h. e. 1440 km/h.

4

When you look at the speedometer in a moving car, you can see the car's
 a. average speed. b. instantaneous speed. c. average acceleration. d. instantaneous acceleration. e. average distance traveled.

5

In the graph below, which runner started out the fastest?
 a. Bob b. Both Albert and Bob c. Albert d. Charlie

6

If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of the tube first?
 a. The coin b. Neither-they will both reach the bottom at the same time. c. The feather

7

Acceleration is defined as
 a. the rate at which an object freely falls from rest b. the distance an object has fallen c. the rate at which distance is covered d. the rate at which velocity itself changes

8

In order for an moving object to have a constant velocity, the object must
 a. move with a constant speed b. move in a straight line c. both a and c

9

What are the units for acceleration?
 a. m/s b. m2/s c. m/s2 d. m2/s2

10

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?
 a. Your speed is constant. b. Your acceleration is constantly changing. c. Your velocity is constant. d. You and the car are accelerating. e. Your direction is constantly changing.

11

When you look at the speedometer in a moving car, you can see the car's
 a. average distance traveled. b. instantaneous acceleration. c. instantaneous speed. d. average speed.

12

A minivan starts from rest and after 7 seconds it is moving at 42 m/s. What is the minivan’s average acceleration?
 a. 0.17 m/s2 b. 7 m/s2 c. 6 m/s2 d. 1.67 m/s2 e. none of the above

13

An object moves away from a motion detector with a constant speed. Which graph best represents the motion of the object?
 a. b. c. d.

14

Acceleration is defined as the CHANGE in
 a. velocity divided by the time interval. b. velocity of an object. c. distance divided by the time interval. d. time it takes to move from one speed to another speed. e. time it takes to move from one place to another place.

15

Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is
 a. 360 km/h. b. 30 km/h. c. 60 km/h. d. 180 km/h.

16

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?
 a. The feather b. The coin c. Neither—they will both reach the bottom at the same time.

17

A vector is a quantity that has
 a. magnitude and direction. b. magnitude and time. c. time and direction. d. none of the above

18

In the absence of air resistance, objects fall at constant
 a. acceleration. b. distances each successive second. c. speed. d. velocity. e. all of the above

19

A ball is thrown straight up and then falls straight back down. When it attains maximum height, the ball’s velocity is
 a. equal to its displacement divided by the time. b. at its minimum. c. equal to its displacement. d. at its maximum.

20

When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?

21

A train travels 5 meters in the first second of travel, 5 meters again during the second second of travel, and 5 meters again during the third second. Its acceleration is
 a. 15 m/s2. b. 10 m/s2. c. 5 m/s2. d. 0 m/s2. e. none of the above

22

A freely falling object starts from rest. After falling for 15 seconds, it will have a speed of about
 a. 75 m/s. b. more than 750 m/s. c. 150 m/s. d. 15 m/s. e. 750 m/s.

23

What are the units for velocity?
 a. m/s c. m/s2 b. m2/s d. m2/s2

24

A bike travels at a constant speed of 5 m/s for 10 seconds.  How far did it travel?
 a. 50 meters b. 500 meters c. 0.5 meters d. 5 meters

25

As an object falls freely in a vacuum, its
 a. velocity increases. b. acceleration increases. c. both A and B. d. none of the above.

26

A bike travels at a constant speed of 5 m/s for 10 seconds.  How far did it travel?
 a. 5 meters b. 500 meters c. 0.5 meters d. 50 meters

27

A ball is thrown straight up. At the top of its path its instantaneous speed is

28

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be
 a. less than the speed it had when thrown upwards. b. more than the speed it had when thrown upwards. c. the same as the speed it had when thrown upwards.

29

A freely falling object starts from rest. After falling for 2.5 seconds, it will have a speed of about
 a. 12.5 m/s. b. 100 m/s. c. 25 m/s. d. 50 m/s. e. none of the above

30

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be
 a. less than the speed it had when thrown upwards. b. it would not come back down if there were no air resistance c. more than the speed it had when thrown upwards. d. the same as the speed it had when thrown upwards.