This is just a question I made up because there'll probably be one like this on our final exam. A 5 kg block is on an incline plane of 50 degrees. coeffecient of friction is 0.5. Will it slide? N = mg cos(50) N = 31.529 friction = mu * N friction = 15.764 force down = ma f =m g cos(50) f = 31.529 force down > friction so it will slide.