Compound Machines

COMPOUND MACHINES

FORCE, WORK AND ENERGY

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A compound machine is made up of two or more simple machines working together. An example of a compound machine that can be found in the home, classroom, or workplace is a pair of scissors. Scissors are made up of two wedges and two levers. Compound machines save people time, effort, and even injury.

Multiple Choice

What machine is a seat belt an example of ?

• Kitchen appliance
• Musical instrument
• Safety device
• Gardening tool

Multiple Choice

How many classes of levers are there ?

• There are five classes of levers.
• There are three classes of levers.
• There are two classes of levers.
• There are four classes of levers.

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. Compound machines save people -------, effort, and even injury.

"What is the oldest known example of a compound machine "

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What was the first compound machine? According to Peter Lu, the oldest evidence of compound machines are the patterns on the small rings identified as Archimedes' spirals. Simple machines that move in only one way date back at least 5000 years, to the invention of the potter's wheel.

Multiple Choice

Simple machines that move in only one way date back at least .................. years to the invention of the potter's wheel.

• 5000

• 10,000
• 1,000
• 500

Multiple Choice

What do you call a machine made up of two or more simple machines?

• single machine
• complex machine
• advanced machine
• compound machine

Multiple Choice

What simple machines make up a pair of scissors?

• lever and wedge
• inclined plane and screw
• wheel and axle
• screw and pulley

Multiple Choice

A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?

• gear, spring, screw
• screw, wedge, inclined plane
• pulley, wedge, lever
• lever, wheel and axle, pulley