Zoom in on Simple Machines; Levers by Andrea Rivera

A lever is a

• A type of pulley used to lift heavy objects.

• A type of inclined plane used to move objects uphill
• A simple machine consisting of a rigid bar that rotates around a fixed point called a fulcrum.

What supports the bar?

• a fulcrum

• a weight

• a load

A load is at one end of the lever. _____ is applied to the other end. The lever lifts the load.

• Effort

• Fulcrum

• Bar

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Levers give a mechanical advantage. People can us LESS ____ to move the load.

• stress

• pull

• force

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A _________uses a lever. A load goes in the tray.

• car

• wheelbarrow

• tractor

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A Nutcracker uses a _____.

• pulley

• inclined plane

• lever

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Less force is needed when the fulcrum is _____ to the load.

• the same

• closer

• beside

A baseball bat is another type of lever. A person's _____ are the fulcrum.

• feet

• hands

• skin

We use levers every day. Which of these is a type of lever?

• scissors

• pulley

• wheel

Ancient people used levers. _______ was a Greek mathematician who wrote about levers.

• Archimedes

• Anastasia

• Anakin Skywalker