Download CH. 6 Sec. 2

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Skills Worksheet
CH. 6 Sec. 2
Section: Newton’s Laws of Motion
NEWTON’S FIRST LAW OF MOTION
Part 1: Objects at Rest
Circle the letter of the best answer for each question.
1. Which is an example of an object at rest?
a. a jet flying overhead
b. a chair on a floor
c. a rabbit jumping
d. a ball hit by a bat
Part 2: Objects in Motion
2. When will objects at rest not stay at rest?
a. when there is no horizontal motion
b. when there is no vertical motion
c. when there is no friction
d. when objects are acted upon by unbalanced forces
3. What happens to your body’s motion when the bumper car you’re riding
in hits a stopped car?
a. Your motion stops.
b. Your motion continues with less velocity.
c. Your motion continues with the same velocity.
d. Your motion continues with greater velocity.
Friction and Newton’s First Law
4. If you slide your desk across the floor, what makes it stop?
a. friction
b. gravity
c. the weight of the desk
d. the speed of the desk
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Forces and Motion
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Directed Reading B continued
Circle the letter of the best answer for each question.
5. What is friction?
a. an unbalanced force
b. a horizontal force
c. gravitational force
d. a constant force
Inertia and Newton’s First Law
6. What is Newton’s first law sometimes called?
a. the law of friction
b. the law of unbalanced forces
c. the law of acceleration
d. the law of inertia
7. Why do objects that are at rest stay at rest?
a. friction
b. velocity
c. gravity
d. inertia
8. Why do objects that are moving keep moving?
a. friction
b. velocity
c. gravity
d. inertia
Mass and Inertia
9. What kind of thing has less inertia?
a. something with a large mass
b. something with a small mass
c. something that is moving
d. something that is not moving
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Forces and Motion
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Directed Reading B continued
NEWTON’S SECOND LAW OF MOTION
Part 1: Acceleration Depends on Mass
Circle the letter of the best answer for each question.
10. Why does it take more force to accelerate a full grocery cart than an empty
one?
a. The full cart has more mass.
b. The full cart is harder to steer.
c. The empty cart has more mass.
d. You run into air resistance.
Part 2: Acceleration Depends on Force
11. If you give a cart a harder push, what happens to its acceleration?
a. It decreases.
b. It increases.
c. It stays the same.
d. It varies.
Expressing Newton’s Second Law Mathematically
12. Why is a watermelon harder to accelerate than an apple?
a. The watermelon is harder to grip.
b. The apple has greater mass.
c. You can hold an apple in one hand.
d. The watermelon has greater mass.
13. Which of the following is the equation for Newton’s second law of
motion?
a. F = m+ a
b. F = m a
c. F = m a
d. F = g t
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Forces and Motion
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
NEWTON’S THIRD LAW OF MOTION
Circle the letter of the best answer for each question.
14. Which is a simple way to describe Newton’s third law of motion?
a. Acceleration depends on force.
b. All forces act in pairs.
c. An object at rest remains at rest.
d. A moving object remains in motion.
Force Pairs Do Not Act on the Same Object
15. What would happen if action and reaction forces acted on the same object?
a. The object would move forward.
b. The object would move backward.
c. The result cannot be predicted.
d. The object would not move.
All Forces Act in Pairs—Action and Reaction
16. What reaction force pushes on a jumping rabbit’s legs?
a. friction
b. gravity
c. Earth pushing upwards
d. the rabbit pushing on Earth
17. What is the reaction force that sends a space shuttle into space?
a. thrusters pushing on Earth’s gravity
b. thrusters pushing on exhaust gases
c. gases pushing downward on Earth
d. gases pushing the shuttle upward
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Forces and Motion
Name ______________________________ Class ___________________ Date __________________
Directed Reading B continued
Circle the letter of the best answer for each question.
18. Why doesn’t a bat move backwards when it hits a ball?
a. The bat exerts an action force on the ball.
b. The ball exerts a reaction force on the bat.
c. The batter exerts another force on the bat.
d. The ball flies off the bat.
The Effect of a Reaction Can Be Difficult to See
19. When you drop a ball, what is the action force on the ball?
a. the ball’s gravity
b. Earth gravity
c. friction between the ball and Earth
d. your weight
20. When you drop a ball, what is the reaction force on the Earth?
a. the ball’s gravity
b. Earth’s gravity
c. friction between the ball and Earth
d. your weight
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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