Question

Imagine you are asked to push a heavy box across the floor. At first, you need to push very hard but once the box has started to move you can push less strongly yet still keep moving. Why is this?

Answer 1

1) When you push a heavy box across the floor, the force you need to apply to start the box moving is greater than the force needed to keep the box moving.

This is because the coefficient of stat friction is greater than the coefficient of kinetic friction.