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Lesson 01 – What Is a Pulley?

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Read About Pulleys

Vocabulary

Read the vocabulary terms to understand the reading better.

A compound pulley is a pulley that is made up of two or more pulleys.

A fixed pulley is a pulley that stays in one place.

A force is a push or pull on an object that makes it move.

A groove is a narrow cut in a surface.

A moveable pulley is a pulley that changes position.

A pulley is a simple machine that uses a wheel that has a groove in it.

A structure is made from different parts and joined together in a certain way to support a load.

What Is a Pulley?

Machines make our lives easier. They let us do tasks with much less effort. For example, think of an elevator. To use an elevator, just step in and push a button. Step off when you reach your floor. Now think of using the stairs. Climbing stairs takes much more effort, and takes more time, too.

Machines can save both time and effort. Not all machines are complicated. Some are very simple. A wheel is a simple machine. Wheels make it easier to move heavy loads. Small wheels on heavy furniture makes the furniture easier to move.

A pulley is a simple machine that uses a wheel that has a groove in it. A rope or cable fits into the groove. The wheel helps the rope move.

A pulley can be placed above a heavy object that you want to lift. You pull down on the rope to lift the object. It is easier to lift an object by pulling down than by pulling up. When you pull down, you can use the weight of your body to help you.

To learn more about pulleys, watch the video by SciShow Kids on Youtube.

Now Show What You Know!

Complete some questions about the reading selection by clicking “Begin Questions” below.