Download Newton`s Laws

Name
LESSON
Date
Outline
Newton’s Laws
Use your textbook to help you fill in the blanks.
What is Newton’s first law of motion?
1. According to Newton’s first law of motion, an object
at rest tends to stay at rest unless acted upon by a(n)
unbalanced
force.
change
2. Balanced forces do not
motion.
an object’s
3. The tendency of a moving object to keep moving in a straight
inertia
line is
.
moving
4. If a car crashes, the passengers keep
forward due to inertia.
What is Newton’s second law of motion?
5. According to Newton’s second law of motion,
acceleration
depends on an object’s mass and the
amount of net force applied to it.
© McGraw-Hill Education
6. Acceleration increases if the
increases.
7. Acceleration decreases if the
increases.
momentum
8. The
object’s mass and speed.
force
mass
of an object depends on the
9. A train has more momentum than a truck traveling
at the same speed because the train has more
mass
Unit 4 • Forces and Motion
Unit Resources
.
Use with Lesson 4
Newton’s Laws
4-45
LESSON
Name
Outline
Date
What is Newton’s third law of motion?
10. Newton’s third law of motion states that when one object
exerts a force on another, the second object exerts a(n)
equal
force in the opposite direction.
11. In Newton’s third law, the first object’s force is called a(n)
action
force.
12. The second object’s push back on the first is known as
a(n)
reaction
force.
13. Action-reaction forces do not cancel each other because
different
they act on
objects.
What is weightlessness?
14. Astronauts experience weightlessness because they do
not seem to feel the force of
gravity
.
15. Objects that experience no detectable gravitational pull
have
true
weightlessness.
Critical Thinking
According to Newton’s second law of motion, the acceleration of an
object decreases if its mass increases. The snowball would slow down
as it got bigger. Therefore, continually increased force would have to
be applied to the snowball to maintain its starting speed.
4-46
Unit 4 • Forces and Motion
Unit Resources
Use with Lesson 4
Newton’s Laws
© McGraw-Hill Education
16. A snowball rolling down a snow-covered hill gets larger
and larger as it rolls. For it to maintain its starting speed,
what must happen? Explain.