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# Forms of Energy

## The ability to cause changes in matter. Defines six different forms.

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Let's Play Pinball

### Let's Play Pinball

Credit: Richfife
Source: http://commons.wikimedia.org/wiki/File:High_Speed_Playfield.JPG

Do you like to play pinball? You have to have quick reflexes to be a pinball champ. All those flippers, bumpers, and other moving devices shoot the ball around the table at very high speeds. How do they do it? Solenoids are the answer.

#### The Back Story

• A solenoid is a very simple device, but it really packs a punch. It consists of a coil of wire that turns into a magnet when electric current runs through it.
• Solenoids have been around for a long time and are found in an amazing variety of devices, from door latches to car starters.
• Credit: Jessica Paterson
Source: http://www.flickr.com/photos/modernrelics/1094659864/

An old device used to call servants that uses solenoids [Figure2]

• How are solenoids used in pinball machines? Watch this short video to find out:

#### Can You Apply It?

1. Solenoids make use of electromagnetism. What is electromagnetism?
2. Explain how a solenoid works.
3. How does a solenoid convert energy from one form to another?
4. Identify the three types of solenoids. Which type is most common? Which type is used in pinball machines?
5. Explain one way that solenoids are used in pinball machines.
6. What are some other real-world applications of solenoids?

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