How Do a Pulley and Wheel-and-Axle Help People Do Work?

A _________ is the made of a wheel and an axle joined together.

• Pulley
• Fulcrum
• Wheel and Axle

The bar in which a wheel turns is called what?

• fulcrum
• wheel
• axle
• bar

To be a simple machine, the wheel and axle must turn together.

• True
• False

Name at least 2 examples of a wheel-and-axle.

• salad spinner and a door knob
• dog and cat
• pulley and fulcrum

In a faucet, the _________ is the wheel.

• water
• handle
• spout
• soap

A ___________ is a wheel with a line wrapped around it.

• pulley
• handle
• fulcrum
• axle

A pulley does not change how work is done.

• True
• False

What does a pulley do to the force acting on an object

• nothing
• changes direction
• changes weight
• changes size

What does adding pulleys do to force?

• raises the force needed.
• lowers the force needed.

Groups of pulleys are used to lift __________ loads.

• light
• heavy
• all
• no