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March 6, 2015

March 6, 2015

Posted by **George** on Monday, September 20, 2010 at 2:09am.

(a) What is the coefficient of static friction between the desk and the floor?

(b) What is the coefficient of kinetic friction between the desk and the floor?

I know that F=ma, but how do you do this?

- Physics -
**drwls**, Monday, September 20, 2010 at 8:14amYou don't use F = ma. The desk is not accelerating. All that equation tells you is that the pusing force is equal to the opposiing friction force. The net force on the desk is zero.

The static coefficient of friction is 300N/(M g)

The kinetic coefficient of friction is

185/(M g)

Note that the denominator is the weight, not the mass.

Plug in for mass M and g (the acceleration of gravity) and crank away.

- Physics -
**George**, Tuesday, September 21, 2010 at 3:42amThanks!

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