1. The problem statement, all variables and given/known data Samantha and Rebekah each push on a stack of doughnuts equally. If the coefficient of static friction is .28 and the box has a mass of 18kg, what force does each push individually to break static friction? Once it's moving, the coefficient of kinetic friction is .17, how much will the doughnuts be accelerated onto the floor? mass of object = 18kg coefficient of friction (static) = .28 coefficient of friction (kinetic) = .17 2. Relevant equations The only one I know that is obvious to use is f = ma, not sure how to apply it to this context 3. The attempt at a solution On the x and y plane, I know the force diagram reads normal force traveling up, force of gravity traveling down, Applied force traveling right, and force of friction traveling left.