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

Look at the picture and read the labels.

Step 2 — Do

Drop a feather and a coin at the same time from the same height. Which hits the ground first?

Step 3 — Observe

Draw a picture of what you observe.

Step 4 — Record

Share your results with a partner.

1 of 3

What happens when opposite poles of magnets meet?