Here's a breakdown:

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

* Net Force: The overall force acting on an object, taking into account all forces in different directions.

* Motion: A change in position over time.

Key Point: An object will only move if there's a net force acting on it. If the forces acting on the object are balanced (like pushing a wall), there's no net force, and the object won't move.