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December 20, 2014

December 20, 2014

Posted by **Bella** on Wednesday, September 30, 2009 at 5:14pm.

I keep getting .0510 or -.0510 but it's wrong.

Ff=M*N Ff=Fnet=m*a N=m*g these are formula's i've used..

- Physics -
**drwls**, Wednesday, September 30, 2009 at 5:25pmThe force that makes it start moving and accelerating satisfies these two equations:

F - M g k = M a

F = M g s

Therefore

M g (s-k) = M a

a/g = 0.051 = s - k

You can also use the second equation to write

16.5 = M g s = 7.5*9.8 s = 73.5 s

s = 16.5/73.5 = 0.224

k = s - .051 = 0.173

Those are the static and kinetic coefficients of friction, respectively.

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