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Lesson 07 – Opposite Directions

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Read More About Gears

Vocabulary

Read the vocabulary terms to understand the reading better.

A gear is a wheel with teeth around it that slot together with other gears.

In a gear train, several gears contact each other, and each gear moves in the opposite direction of its neighbours.

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

Opposite Directions

Pulleys and gears can change the direction of motion. In a gear train, several gears contact each other. Each gear moves in the opposite direction of its neighbours.

Imagine a machine that uses gears like the ones above. But there is a problem—the two gears need to move in the same direction. How could you do that?

This problem is not difficult to solve. Simply insert a gear in the middle.

You can connect two pulleys with a belt or chain. This makes a drive system. Both pulleys will move in the same direction.

If the belt is crossed between two pulleys, the pulleys will move in opposite directions.

Now Show What You Know!

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