Two part question: Suppose you are running around the curve of a track. Centripe

Question

Two part question:

Suppose you are running around the curve of a track. Centripetal force prevents you from slipping laterally relative to your direction of motion with each step. Which force is most likely responsible for preventing this slip?

a) Drag

b) Static Friction

c)Tangential Propulsion

Consider the parameters from the previous problem. Your foot does not slip laterally relative to your direction of motion. Assume you are moving at 4m/s and the radius of the curve is 18m. What is the coefficient of friction of the track?

Explanation / Answer

Correct option is (b)

v = 4 m/s , r = 18 m

acceleration due to gravity g = 9.8 m/s^2

v^2 = u*r*g

4^2 = u*18*9.8

coefficient of friction u = 0.091

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