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Suppose you exert a horizontal push on a crate that rests on a level floor and it doesn't move How much friction acts compared with your push?
If the crate doesn't move, then the forces on it are balanced, and they add up to zero.
The force of friction is equal to the force of your push, and acts in the opposite direction.
Neither you nor the friction does any work.
Note that as long as this is going on, these statements are all true regardless of whether
the floor is level or sloped.
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