Hello all, 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!!