Download Newton`s First Law - Burnet Middle School

Name
Date
Class
Lesson Quiz A
LESSON 2
Newton’s First Law
True or False
Directions: On the line before each statement, write T if the statement is true or F if the statement is false.
1. To find net force, you must specify the direction in which each force acts.
2. According to Newton’s first law, the motion of an object does not change if the
net force acting on it is zero.
3. If there were no friction, a moving object would keep moving, even if no other
force were applied to it.
4. Inertia is two or more forces acting in opposite directions.
Multiple Choice
Directions: On the line before each question, write the letter of the correct answer.
5. If one force of 30 N and another force of 85 N result in a net force of 55 N,
which term describes the two forces?
A. negative forces
B. balanced forces
C. unbalanced forces
a car crash?
A. inertia
B. gravity
C. velocity
7. What happens to an object at rest if balanced forces act upon it?
A. The object remains at rest.
B. The object begins to move at a constant speed.
C. The object begins to move and then slows down.
8. If the reference direction is to the left and a force of 45 N acts to the left
while another force of 65 N acts to the right, how much net force is acting
on the object?
A. 20 N
B. –20 N
C. 110 N
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The Laws of Motion
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
6. Which term explains why a crash-test dummy lunges forward during
Name
Date
Class
Lesson Quiz B
LESSON 2
Newton’s First Law
Completion
Directions: On each line, write the term that correctly completes each sentence.
1. Because forces have direction, you must specify a(n)
direction when you combine forces.
2. Newton’s first law of motion states that if the net force on an object is
, then the motion of an object does not change.
3. Objects in motion eventually stop moving due to a(n)
or
other outside forces that are applied to them.
4.
is the tendency of an object to resist a change in its
motion.
Short Answer
Directions: Respond to each statement on the lines provided.
5. Two people apply force to object A. Each person applies a force of 20 N. Two different
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
people apply a force to object B. Each of them also applies a force of 20 N. However,
the net force acting on object A is different from the net force acting on object B.
Determine what happened.
6. Explain why a crash-test dummy falls forward when the car it is in crashes head on or
stops suddenly.
7. Predict what would happen to an object that is at rest if balanced forces acted upon it.
8. Calculate the net force acting on an object if the reference direction is to the left, a
force of 65 N acts on the object to the left, and a force of 90 N acts on the object to the
right. Explain your calculations.
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Name
Date
Class
Lesson Quiz A
LESSON 3
Newton’s Second Law
True or False
Directions: On the line before each statement, write T if the statement is true or F if the statement is false.
1. Only unbalanced forces change an object’s velocity.
2. Centripetal force causes an object in circular motion to move along a straight
path.
3. Unbalanced forces can cause an object in motion to accelerate.
4. If the direction of the net force acting on an object is opposite to the direction
of movement, the object will speed up.
Multiple Choice
Directions: On the line before each question or statement, write the letter of the correct answer.
5. A ball held in a person’s hand does not move, even though gravity is acting on
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
it because
A. the force of gravity creates a net unbalanced force.
B. the force of gravity is not strong enough to move the ball.
C. the force of gravity is balanced by the force exerted by the hand.
6. According to Newton’s second law of motion, which equation determines
acceleration of an object? [a = acceleration; F = force; m = mass]
F
A. a = __
m
m
B. a = __
F
C. a = m – F
7. Which situation is NOT the result of an unbalanced force acting on an object?
A. an object speeds up
B. an object maintains speed
C. an object changes direction
8. How does inertia act on an object that is moving in a circle?
A. It causes the object to speed up as it moves.
B. It causes the object to move along a straight path.
C. It directs the object toward the center of the curve.
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Name
Date
Class
Lesson Quiz B
LESSON 3
Newton’s Second Law
Completion
Directions: On each line, write the term that correctly completes each sentence.
1. Only
2.
forces change an object’s velocity.
force acts on an object that is moving in a circular motion in
a direction toward the center of the curve.
3. Unbalanced forces can make an object
by changing its speed,
its direction, or both.
4. The speed of an object in motion will
if the net force acting
on it is opposite the direction that the object is moving.
Short Answer
Directions: Respond to each statement on the lines provided.
5. Balanced forces act on a ball that is being held above the ground in someone’s hand.
Explain why these forces on the ball are balanced.
acting on it using Newton’s second law of motion. Explain your calculations.
7. State some of the ways that unbalanced forces acting on an object can affect the
motion of that object.
8. Determine how inertia and centripetal force affect the motion of a planet orbiting
the Sun.
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The Laws of Motion
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
6. Calculate the acceleration of an object with a mass of 2 kg that has a force of 30 N
Name
Date
Class
Lesson Quiz A
LESSON 4
Newton’s Third Law
True or False
Directions: On the line before each statement, write T if the statement is true or F if the statement is false.
1. Force pairs act in opposite directions and are the same strength.
2. An object’s momentum is the product of its mass and acceleration.
3. In a force pair, one force is the action force and the other force is the second
force.
4. According to Newton’s third law, when an object applies a force on a second
object, the second object applies a weaker reaction force in response.
Multiple Choice
Directions: On the line before each question or statement, write the letter of the correct answer.
5. Which type of collision occurs when a baseball bat hits a baseball?
A. elastic
B. inelastic
C. accelerated
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
6. The law of conservation of momentum states that the total momentum of a
group of objects
A. increases after a collision.
B. decreases after a collision.
C. remains the same after a collision.
7. When a gymnast performs, which force is most important in determining how
high he or she jumps?
A. the downward force of gravity
B. the friction exerted by the ground
C. the action force that the gymnast exerts on the ground
8. Which term is a force that can slow momentum?
A. mass
B. inertia
C. friction
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Name
Date
Class
Lesson Quiz B
LESSON 4
Newton’s Third Law
Completion
Directions: On each line, write the term that correctly completes each sentence.
1. Force pairs are equal forces that act in
directions.
2. Momentum is found by multiplying an object’s
by its
velocity.
3. A force pair is made up of an action force and a(n)
force.
4. Newton’s third law of motion states that when one object applies a force on a second
object, the second object applies a(n)
direction.
force in the opposite
Short Answer
Directions: Respond to each statement on the lines provided.
5. Contrast an elastic collision with an inelastic collision.
7. A runner pushes his foot against the ground to move forward. Determine the other
force that occurs at the same time to move the runner.
8. Analyze why greater force is required to stop a grocery cart filled with groceries than
is required to stop an empty cart that is moving at the same velocity.
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The Laws of Motion
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
6. State the law of conservation of momentum in your own words.