Name
LESSON
Date
Outline
Using Simple Machines
Use your textbook to help you fill in the blanks.
What is a simple machine?
1. An example of a simple machine that has no moving
parts and can be used to remove the lid from a paint can
screwdriver
is a(n)
.
2. Simple machines make it easier to do work by
changing either the
force
to do the work or the
which the force is applied.
distance
needed
through
3. The number of times a simple machine multiplies an effort
force is called the mechanical advantage .
4. The mechanical advantage is found by dividing the
output
force by the
effort
force.
5. Simple machines do not decrease the amount of
work
that needs to be done.
© McGraw-Hill Education
What are the kinds of levers?
levers
6. Although there are three classes of
all three types consist of a rigid bar and a pivot point.
7. The pivot point of a lever is called the
,
fulcrum
.
8. The part of the bar where the effort force is applied is
called the
effort
Unit 6 • Work, Power, and Efficiency
Unit Resources
arm.
Use with Lesson 2
Using Simple Machines
6-17
LESSON
Outline
Name
Date
Which other machines are like levers?
first-class
9. A wheel and axle is a type of
lever.
10. A grooved wheel that turns by the movement of a
rope in the groove is called a(n)
pulley
.
movable
11. A pulley system can contain both fixed and
pulleys.
What are inclined planes?
ramp
12. An inclined plane, or
easier to move heavy loads.
, makes it
13. A knife is an example of a type of inclined plane called
a(n)
wedge
.
What are compound machines?
14. A compound machine, such as a bicycle or a pair of
scissors, combines two or more
to make one device.
lubricant
15. Applying a(n)
a machine’s efficiency.
simple machines
, such as oil, increases
Critical Thinking
Possible answer: Simple machines change the amount of force we
need to do work, or they change the distance so that the work
becomes easier for us. However, the actual work done does not
change.
6-18
Unit 6 • Work, Power, and Efficiency
Unit Resources
Use with Lesson 2
Using Simple Machines
© McGraw-Hill Education
16. Do simple machines reduce the amount of work we
do? Explain.