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Name[pic]Date[pic] Class[pic]

Forces [pic] Chapter Test

Forces

[pic]

Multiple Choice

Write the letter of the correct answer on the line at the left.

[pic] 1. Friction acts in a direction to the

direction of an object’s motion.

a. unrelated b. opposite

c. equal d. perpendicular

[pic] 2. Unless an object at rest is acted upon by a force, it stays at rest due

to its

a. matter. b. inertia.

c. friction. d. gravity.

[pic] 3. A 10-kg ball is accelerated 500 m/s2 by a force of

a. 5000 N. b. 50 N.

c. 500 N. d. 1/50 N.

[pic] 4. The momentum of a 1500-kg car traveling at a velocity of 10 m/s is

a. 15,000 N. b. 15 m/s2.

c. 150 N. d. 15,000 kg·m/s.

[pic] 5. A(n) can cause an object’s motion to change.

a. unbalanced force b. balanced force

c. weight d. inertia

[pic] 6. The amount of matter in an object is called its

a. weight. b. force.

c. inertia. d. mass.

[pic] 7. Newton’s second law of motion states the relationship of mass,

acceleration, and force. It says that

a. force equals mass divided by acceleration.

b. force equals acceleration divided by mass.

c. acceleration equals force divided by mass.

d. every object attracts every other object in the universe.

[pic] 8. A(n) causes objects to move in a

circle.

a. centripetal force b. large weight

c. terminal velocity d. acceleration

[pic] 9. The unit of force, a newton, is equal to

a. the amount of mass in an object.

b. mass[pic]velocity.

c. kg·m/s.

d. kg·m/s2.

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

Name[pic]Date[pic] Class[pic]

Forces [pic] Chapter Test

[pic] 10.An object in free fall until it reaches

terminal velocity.

a. decreases in mass b. slows down

c. accelerates d. is unbalanced

Completion

Fill in the blank to complete each statement.

11. Weight is the measure of the force of on an

object.

12. A newton is a unit of .

13. Air rushing against an airplane is an example of

friction.

14. The momentum of an object depends on its mass and

.

15. The total momentum of any group of objects remains the same unless an

outside acts on the objects.

True or False

If the statement is true, write true. If it is false, change the underlined word or words

to make the statement true.

16. Forces can be added together only if they are act-

ing on different objects.

17. According to Newton’s second law of motion,

acceleration increases as force increases, if mass

stays the same.

18. The force exerted by gravity is stronger if two

objects are closer.

19. The force of friction acts between all objects in

the universe.

20. A satellite in orbit around Earth is always falling

toward Earth.

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

Name[pic]Date[pic] Class[pic]

Forces [pic] Chapter Test

Using Science Skills: Interpreting Diagrams

[pic]

Use the diagram below to answer the following questions. Answer the questions in

brief paragraphs on a separate sheet of paper.

[pic]

21. What happens in the rocket engine at point A? How does the rocket take

off? Include these terms in your answer: action and reaction force,

acceleration, force, and gravity.

22. What is happening to the rocket at point B? Explain what keeps the

rocket from falling back to the surface or moving off into space.

Essay

Write a brief paragraph to answer each of the following. Use a separate sheet of paper

if necessary.

23. What forces are acting on you when you slide down a water slide? What

type of friction is present? If the water slide were dry, would the

frictional forces be different? Explain.

[pic]

24. An astronaut throws a baseball on the moon, where there is no air. Back

on Earth, you throw an identical baseball using the same force that the

astronaut used to throw her ball. Which ball will travel a greater

distance before it hits the ground? Explain.

[pic]

25. You blow up a balloon and pinch the open end closed. Predict what will

happen when you let go of the balloon in terms of Newton’s third law of

motion.

[pic]

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

Name[pic] Date[pic] Class[pic]

Forces [pic] Chapter Test

Using Science Skills: Applying concepts

Answer the following questions in the spaces provided.

[pic]

Before

Collision

After

Collision

Velocity of

Ball B = ?

Velocity of

Ball A = 1 m/s

Velocity of

Ball B = 0 m/s

Velocity of

Ball A = 0.5 m/s

26. What is the total momentum of the two balls before the collision?

[pic]

27. If the total momentum remains the same after the collision, what is the

new velocity of Ball B?

[pic]

Essay

Write a brief paragraph to answer each of the following on a separate sheet of paper.

28. Archaeologists are still not sure how the prehistoric people of England

moved the giant blocks that were used to build Stonehenge. What forces

would be at work if you were trying to move a 20,000-kg block of stone?

Without using a cart or a truck, how could you move the stone? Would

you need the same force to keep the stone moving as you did to get it

started? Explain.

29. Some communications satellites appear to stay in the same place above

Earth’s equator. Explain why these satellites don’t fall back to Earth.

30. Explain how a parachute works. Use the terms air resistance, surface

area, and gravity.

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