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I'm new to this site and think it's a great idea to have a Physics site to help with, b/c we all know physics is the devil.... (j/k) :)

Anyway I have this problem which I think i figured out but want to be sure.

Suppose a block of mass 25 kg rests on a horizontal surface and the coefficient of static friction is .22

a). What is the maximum possible Fs that could act on the block.

This is what I got, Fs=m*g*Us

x=(25)(10)(.22) = 55N

b). What is the avtual Fs that acts on the block if an external force of 25N acts horizontally on the block.

ME:

55-25= 30M

And this problem:

2). A 5kg block rests on a horizontal plane a force of 10N applied horizontally causes the block to more horizontally at a constant velocity. What is the coefficient of friction b/w the block and the plane, assume G is 9.8 m/s^2.

My answer doesn't make sense because the coefficient is not between 0 and 1.0 :uhh:

Anyway:

ME:

(9.8)(5)/10= about 5

Any ideas?

Thanks in advance!!