|Suppose that you want to move a heavy file cabinet which is standing in the
middle of your office into a corner. You push on it, but nothing happens. What
is going on?
Which force of equal magnitude points in a direction opposite to the direction of the force you are applying?
You push harder. Eventually the cabinet breaks away and starts accelerating. But you have to keep on pushing just to keep it moving with a constant velocity. When you stop pushing, it quickly slows down and comes to rest. Why?
Where do these frictional forces come from?