You try to push a crate of weight M with a force F on a horizontal floor. The coefficient of static friction is μs, and you exert the force F under an angle φ below the horizontal. Determine the minimum value of F that will move the crate. Okay so basically what i did was equate Mμs=Fcos φ and evaluate for F. however the answer my teacher gave me is slightly different. He use Nμs=Fcos φand he found N by evaluating the forces in the y component. So the question is why cant i just equate the force applied with the static friction?