A large crate with mass rests on a horizontal floor. The coefficients of friction between the crate and the floor are u_s and u_k. A woman pushes downward at an angle below @ the horizontal on the crate with a force F.

-What magnitude of force is required to keep the crate moving at constant velocity?
Express your answer in terms of m ,g, @ and u_k.

-If u_s is greater than some critical value, the woman cannot start the crate moving no matter how hard she pushes. Calculate this critical value of u_s .

Express your answer in terms of @


Get this answer with Chegg Study