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August 3, 2015

Homework Help: Physics

Posted by Mario on Thursday, October 1, 2009 at 11:32am.

A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the box on the plank and gradually raises one end of the plank. When the angle of inclination with the horizontal reaches 30, the box starts to slip, and it slides 2.2 m down the plank in 4.4 s at constant acceleration.
(a) What is the coefficient of static friction?


(b) What is the coefficient of kinetic friction?

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