1. Chapter 12-3 Part 1 Friction: A Force That Opposes Motion
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2. Suppose you and a younger sister or brother are swimming at a neighborhood pool. Your sister or brother asks why there are signs everywhere that say “NO RUNNING”. What would be your answer?

3. Friction
Friction is a force that opposes motion between two surfaces that are touching.

4. All surfaces have “hills and valleys” which stick to the “hills and valleys” of another surface when they touch.

5. Friction Factors
Rougher surfaces create more friction. (more hills and valleys)
Greater force creates more friction. (hills and valleys come into closer contact)