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December 6, 2016

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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