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Click to edit Master subtitle style Analyzing Motion with Friction copy copy Coefficient of Friction (µ) the ratio of the friction force to the normal force (µ = Ff/FN) Constant: only depends on nature of two surfaces in contact *the only way that the coefficient of friction will change is if the two materials in contact change Coefficient of Friction – Kinetic and Static (copy) Practice 1. Which type of road, asphalt or concrete, provides better traction (friction of a tire on a road) for rubber tires under: 2. Determine the appropriate coefficient of friction in each case. A) it takes 59 N of horizontal force to get a 22 kg leather suitcase just starting to move across the floor B) a horizontal force of 54 N keeps the suitcase in (a) moving at a constant velocity 3. A 73 kg hockey player glides across the ice on skates with steel blades (µk = 0.010). What is the force of friction acting on the skater? READ 168 – 170 READ 173- 177 Practice: pg 178 #1,2,3abc,5abc,6,7ab,8,9,10 7/5/2017