Smooth and Rough Surfaces

What You'll Learn

When two surfaces rub together, friction produces heat. Rub your hands together to feel it!

Step 1 — Read

Read and learn: When two surfaces rub together, friction produces heat. Rub your hands together to feel it!

Step 2 — Do

Measure using your ruler or measuring cup.

Step 3 — Observe

Draw a picture of what you observe.

Step 4 — Record

Share your results with a partner.

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What happens when opposite poles of magnets meet?