Here's why:

* Newton's Laws of Motion: These fundamental laws explain how forces interact with objects.

* First Law (Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

* Second Law: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. (Force = mass x acceleration).

* Third Law: For every action, there is an equal and opposite reaction.

* Examples:

* Pushing a box: You exert a force to make it move, changing its state from rest to motion.

* Throwing a ball: The force of your throw causes the ball to accelerate and change direction.

* Friction: A force that opposes motion. It can slow down or stop a moving object.

* Gravity: A force that pulls objects towards each other. It causes objects to fall towards the Earth.

In summary: Forces are the agents of change in motion. They can start, stop, accelerate, decelerate, or change the direction of an object's movement.