1. What do you think makes a surface have more or less friction?
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Scaffold suggestions. List some features of a surface with more friction. Then list some features of a surface with less friction. How are they different? A surface with more friction would have __________ because __________ A surface with less friction would have __________ because __________ Rough surfaces have more friction because ____________. Smooth surfaces have less friction because ___________. Oily surfaces have less friction because _____________.

2. What would reduce the friction between two surfaces? Give an example.
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3. What would increase the friction between two surfaces? Give an example.
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4. How does friction create heat?
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5. Explain why you couldn't light matches in a world with no friction.
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6. Imagine you have a magnifier so that you can see two surfaces in as much detail as you choose. Draw a picture of what happens when two surfaces with a lot of friction slide past each other.

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7. Draw a picture of what happens when two surfaces with very little friction slide past each other.

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