Here's a breakdown:

* Force: A push or pull that can change an object's motion.

* Distance: The amount of space an object moves.

* Motion: The act of moving or changing position.

* Same direction: The force and motion must be in the same direction for work to be done.

Example:

* Pushing a box across the floor. You apply force to the box, and the box moves in the same direction as your force. This is work.

* Holding a heavy weight above your head. You are applying force, but the weight isn't moving. This is not work.

Formula:

Work = Force x Distance