10. Imagine that you have a circular platform made of smooth polished steel. You

Question

10. Imagine that you have a circular platform made of smooth polished steel. You measure it to have a diameter of 0.483m . It is attached to a motor that will rotate the platform with a period that you can set by turning a dial on

the motor. (The period is the time it takes the platform to complete 1 full rotation.) You realize that this device can be used as part of an experiment to measure coefficients of static friction. So, you take a penny out of your pocket and place it at the edge of the platform. Starting at 3.0s you very slowly decrease the period until the penny breaks free and slides off the platform. This happens when the period is 2.1s . Using this data determine the coefficient of static friction between the penny and the steel platform.

Explanation / Answer

F = u*m*g = m*R*W^2

u*g = R*w2^2

u*9.8 = (0.2415*4*3.14*3.14)/(2.1*2.1)

u = 0.22-3

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