Name:    Practice Quiz: Newton's Second Law

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1

A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s2. The acceleration of a mass of 2 kg acted upon by a force of 2 N is
 a. half as much. b. the same. c. twice as much. d. none of the above

2

Suppose the force of friction on a sliding object is 35 N. The force needed to maintain a constant velocity is
 a. 35 N b. more than 35 N. c. less than 35 N.

3

If the force acting on a cart doubles, what happens to the cart's acceleration?
 a. It quarters. b. It stays the same. c. It quadruples. d. It halves. e. It doubles.

4

A push on a 3-kilogram brick accelerates the brick. Neglecting friction, to equally accelerate a 9-kilogram brick, one would have to push
 a. with 3 times as much force. b. with the amount of force. c. with 30 times as much force. d. with just as much force. e. none of the above

5

A 12-N falling object encounters 5 N of air resistance. The magnitude of the net force on the object is
 a. 7 N. b. 0 N. c. 12 N. d. 5 N. e. none of the above

6

How much force is needed to accelerate a 2.0-kg physics book to an acceleration of 4.0 m/s2?
 a. 24.0 N b. 8.0 N c. 0.5 N d. 0 N e. 2.0 N

7

What is the net force in this example?

 a. 1050  Newtons up c. 150 Newtons down b. 150 Newtons  up d. 250 Newtons down

8

A 18-N falling object encounters 3 N of air resistance. The magnitude of the net force on the object is
 a. 15 N. b. 18 N. c. 3 N. d. 0 N. e. none of the above

9

How does acceleration of an object change in relation to its mass? It is
 a. inversely proportional. b. directly proportional. c. Acceleration doesn't depend on mass at all.

10

When an object reaches terminal velocity its acceleration is
 a. 9.8 m/s2. b. 4.9 m/s2. c. 0 m/s2.

11

A tow truck exerts a force of 1500 N on a car, accelerating it at 2 m/s/s. What is the mass of the car?
 a. 250 kg b. 750 kg c. 375 kg d. 1500 kg e. none of the above

12

The picture below illustrates which of Newton's three laws?
 a. Newton’s First Law c. Newton’s Third Law b. Newton’s Second Law d. None of the above

13

A heavy person and a light person parachute together and wear the same size parachutes. Assuming they open their parachutes at the same time, which person reaches the ground first?
 a. Neither -- they both reach the ground together. b. the light person c. the heavy person

14

Friction is a force that always acts
 a. in the same direction as an object's motion. b. opposite to an object's motion. c. perpendicular to an object's motion.

15

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. In the absence of air resistance, which ball has the greater acceleration?
 a. They both have the same acceleration. b. The tennis ball c. The steel ball

16

A sportscar has a mass of 3000 kg and accelerates at 2 meters per second squared. What is the magnitude of the force acting on the sportscar?
 a. 1500 N. b. 4500 N. c. 3000 N. d. 6000 N. e. none of the above

17

A girl pulls on a 9-kg wagon with a constant force of 27 N. What is the wagon's acceleration?
 a. 3 m/s2 b. 243 m/s2 c. 0.3 m/s2 d. 27 m/s2 e. 9 m/s2

18

A toybox is dragged without acceleration in a straight-line path across a level surface by a force of 14 N. What is the frictional force between the toybox and the surface?
 a. 14 N b. Need more information to say. c. More than 14 N d. Less than 14 N

19

A girl pulls on a 5-kg wagon with a constant force of 20 N. What is the wagon's acceleration?
 a. 4 m/s2 b. 20 m/s2 c. 100 m/s2 d. 5 m/s2 e. 0.3 m/s2

20

A station wagon has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the station wagon?
 a. 300 N. b. 2250 N. c. 1500 N. d. 7500 N. e. none of the above

21

Pressure is defined as
 a. time per area. b. velocity per time. c. force per time. d. distance per time. e. force per area.

22

Accelerations are produced by
 a. velocities. b. accelerations. c. forces. d. masses. e. none of the above

23

A box of supplies weighs 50 N. When held at rest in your hands, the net force on the box of supplies is
 a. 5.1 N. b. 490 N. c. 0 N. d. 50 N. e. none of the above

24

You pull horizontally on a 50-kg crate with a force of 300 N and the friction force on the crate is 50 N. The acceleration of the crate is
 a. 5 m/s2. b. 7 m/s2. c. 6 m/s2. d. 2.5 m/s2.

25

The figure shows a block that is being pulled along the floor. According to the figure, what is the acceleration of the block?
 a. 2 m/s2 c. 3 m/s2 b. 4 m/s2 d. 5 m/s2

26

How much force is needed to accelerate a 3.0-kg physics book to an acceleration of 6.0 m/s2?
 a. 0 N b. 54.0 N c. 18.0 N d. 0.5 N e. 2.0 N

27

If the force acting on a cart doubles, what happens to the cart's acceleration?
 a. It quadruples. b. It stays the same. c. It halves. d. It doubles. e. It quarters.

28

A tow truck exerts a force of 3000 N on a car, accelerating it at 1.5 m/s/s. What is the mass of the car?
 a. 667 kg b. 2000 kg c. 3000 kg d. 1000 kg e. none of the above

29

A 12-N falling object encounters 12 N of air resistance. The magnitude of the net force on the object is
 a. 0 N. b. 24 N. c. 12 N. d. none of the above

30

A 50 kilogram skateboarder experiences a 20N force as shown.  What is the expected acceleration of the skateboarder?

 a. 0.4 m/s2 c. 0.2 m/s2 b. 5.0 m/s2 d. 1500 m/s2