February 24, 2017

Homework Help: PHYSICS

Posted by john on Saturday, December 13, 2008 at 10:16pm.

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 2.4 m down the plank in 3.6 s at constant acceleration.
(a) What is the coefficient of static friction?

(b) What is the coefficient of kinetic friction?

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