A block slides down a rough plane. The plane makes an angle of 60 degrees with the horizontal, the weight of the block is 5.0N and the coefficient of kinetic (dynamic) friction between the block and the plane is 0.30.
1) determine the magnitude of the frictional force acting on the block
2) Determine the acceleration of the block down the plane
how would i do these quetions?
Break up the weight of the block into two componetns, one parallel with the plane, one perpendicular.
Parallel mgSinTheta
Perpendicular mgCosTheta.
Now friction force opposing the sliding will be mu*mgCosTheta, so the net force down the plane will be
mgSinTheta-mu*mgCosTheta and that must equal mass*acceleration.