Download Six simple machines have many uses.

SECTION
SIX SIMPLE MACHINES HAVE MANY USES.
CHAPTER 5
Machines
5.2 Reading Study Guide B
BIG IDEA Machines
KEY CONCEPT
help people work by changing the force applied to an object.
Six simple machines have many uses.
Review
The number of times a machine multiplies the input force is the machine’s
mechanical advantage.
Take Notes
There are six simple machines. (p. 154)
1.
Complete the description wheel by naming the six simple machines.
six
simple
machines
A. Lever (p. 155)
2.
Draw a picture of a lever. Label the
input force, output force, and fulcrum.
Explain how a lever makes work easier.
Copyright © by McDougal Littell, a division of Houghton Mifflin Company
I.
B. Wheel and Axle (p. 156)
3.
A doorknob is a wheel and axle. How does a doorknob make work easier?
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C. Pulley (p. 156)
4.
Draw pictures of a fixed pulley and a movable pulley.
Movable Pulley
CHAPTER 5
Machines
Fixed Pulley
D. Inclined Plane (p. 158)
Copyright © by McDougal Littell, a division of Houghton Mifflin Company
5.
Draw a picture that shows an inclined plane. Label the picture to show the input force and
output force.
E. Wedge (p. 158)
6.
How is a wedge similar to an inclined plane? How does it differ? Hint: think
of how each is used.
F. Screw (p. 159)
7.
What are screws usually used for?
II. The mechanical advantage of a machine can be calculated. (p. 160)
8.
What force is not considered when calculating the ideal mechanical
advantage? What efficiency is assumed?
9.
You can calculate the ideal mechanical advantage of an inclined plane by
dividing its length by its height. A ramp outside a school is 12 feet long. If the
height of the ramp is 3 feet, what is its ideal mechanical advantage?
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