A horizontal force, F1 = 85 N, and a force, F2 = 18.4 N acting at an angle of θ to the horizontal, are applied to a block of mass m = 2.1 kg. The coefficient of kinetic friction between the block and the surface is μk = 0.2. The block is moving to the right.

Question

A. Solve numerically for the magnitude of the normal force, FN in Newtons, that acts on the block if θ = 30°.

B. Solve numerically for the magnitude of acceleration of the block, a in m/s2, if θ = 30°.

Answer 1

assuming the force is acting downward?

frictionforce=forcenormal*mu
= (F1*g + F2*sinTheta)mu

acceleration
net force=ma
F2cosTheta-forcefriction=ma
solve for a.