Name
LESSON
Date
Outline
Forces
Use your textbook to help you fill in the blanks.
What are forces?
1. A factor that affects the motion of an object, such as a
force
push or a pull, is a(n)
.
2. When a person or object applies a force by touching an
contact force
object, it is called a(n)
.
noncontact forces
3. Some forces, known as
, can be
applied to an object without another object touching it.
4. A spring scale measures force in metric units called
newtons
.
How do forces affect each other?
5. If two or more forces combine to act on an object, the
result is the
net force
.
6. In a picture, the length of an arrow used to show a force
strength
indicates the force’s
.
© McGraw-Hill Education
7. If the two combined forces acting on an object
are both to the right, the net force will be to the
right
.
8. If one force acting on an object is 200 N to the right
and the other is 100 N to the left, the net force will be
100 N to the
Unit 4 • Forces and Motion
Unit Resources
right
.
Use with Lesson 2
Forces
4-19
LESSON
Outline
Name
Date
What are balanced and unbalanced forces?
opposite
9. If equal forces act in
on an object, the net force is zero.
directions
10. Combined forces with a net force of zero are called
balanced forces
.
unchanged
11. An object’s motion remains
the forces acting on it are balanced.
if
12. The forces acting on stationary objects are always
balanced
.
13. Balanced forces can act on objects that are stationary or
moving
. If an object is moving with a(n)
constant
velocity, the forces acting on it
are balanced.
14. Combined forces with a net force that is not equal to
unbalanced forces
zero are called
. An object’s
motion changes if unbalanced forces are acting on it.
Critical Thinking
15. Give an example in which noncontact forces acting on
an object are balanced.
another magnetic surface due to the repelling magnetic force is
balanced with the pull of gravity. Both the magnetic force and
gravity are noncontact forces.
4-20
Unit 4 • Forces and Motion
Unit Resources
Use with Lesson 2
Forces
© McGraw-Hill Education
Possible answer: A magnetic object appearing to “float” above