00:01
All right, so let's say we have a large mass and a small mass placed against it, and the larger mass is on a frictionless surface, and the coefficient of friction between the blocks is 0 .36.
00:15
So we want to know, actually, the force should go the other way.
00:18
Sorry, what does the magnitude of this force need to be to keep the smaller block in place? so the normal force is going to be basically the larger blocks mass times its acceleration, which is just equal to, yeah, we'll write it this way.
00:38
And the acceleration we know is going to be f over the sum of the two masses.
00:43
So our normal force, if we make that substitution, is going to be m over m plus capital m times f.
00:50
And our frictional force should equal this normal force, or the weight should equal the force, which is mu s times the normal force...