Question

When trying to push a box across a floor, sometimes it moves and sometimes it doesn't. Explain what is happening.
Bot
When trying to push a box across a floor, the box may not move if the force applied is not greater than the force of friction between the box and the floor. Friction is a force that resists motion when two objects are in contact with each other. If the force applied is greater than the force of friction, the box will move.