Overview
1. What is the physical quantity represented by the slopes of friction versus normal force? 2. What pattern do you notice about the coefficients of friction? 3. What happens to the static friction force as the mass is increased? 4. What happens to the sliding friction force as the mass is increased? 5. What are the units for the slope for each graph? Explain. 6. Think about your experience with the friction trays. When a car skids to a stop (with wheels “locked”), which friction force is at work? How do you know? 7. Do your results support your predictions?