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Here's a girl at a table. She holds a magnet above a paper clip, and the clip jumps up.

The magnet never touched it.

Now let's go outside. A boy kicks a ball. His foot has to touch the ball to move it.

So some forces have to touch, and some don't. Which ones? And are there any more that don't?

Now let's go back inside. The girl rubs a balloon on her sweater and holds it over her friend's head.

Her friend's hair rises up toward it! Nothing touched her hair. What's pulling it?

That's this topic: forces that touch, and forces that don't.

Okay, so are you ready to find out which forces don't need to touch?

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