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6. Would the coefficient of friction change if surface area was kept the same and mass was increased? Explain your answer.
7. If you increased the surface area of the "friction block" but kept the mass the same would the coefficient of friction change?
Explain your answer.
8. What would the free-body diagram of a stationary shoe look like? How about the shoe of a person walking forward?
Label the forces (do not assign numbers and don't forget tic-marks!).
Claim-Evidence-Reasoning: (CER) Shoe Bottoms
(student handout continued)
