I need physics help!!!!!!!!!?

Question

I have a physics final tomorrow and I can't figure out this problem.

You want to push a 75N crate across the floor. What force is required to move the crate at a constant velocity if the coefficient of friction is .320?

Answer 1

A key word is "constant velocity." That means there will be no net forces on the object; i.e., any (sideways) force you apply in one direction will be canceled by an exactly equal force in the opposite direction.

What is that opposing force? Friction. How much friction is there? Well, you can calculate that using the numbers in the problem. Look up in your book the definition of "coefficient of friction," and see how that coefficient can be used to calculate the actual force of friction.

Once you know how much friction there is, the problem is essentially solved; because (as pointed out in the first paragraph) the force you apply will be the same amount as the force of friction.