1. The problem statement, all variables and given/known data A block of mass m lies on a horizontal table. The coefficient of static friction between the block and the table is µs. The coefficient of kinetic friction is µk, with µk < µs. Suppose you push horizontally with precisely enough force to make the block start to move, and you continue to apply the same amount of force even after it starts moving. Find the acceleration a of the block after it begins to move. 2. Relevant equations f=ma 3. The attempt at a solution The answer to this example is a=µsg-µkg. I am very confused on problems in which both kinetic and static friction are given. Can someone explain to me what this statement means? If the object is moving, why are we subtracting kinetic from static, should the kinetic be greater at this point?