Mass of the object multiplied by its acceleration.

This is represented by Newton's Second Law of Motion:

F = m * a

Where:

* F is the force

* m is the mass

* a is the acceleration

In simpler terms:

* Force is what causes a change in an object's motion.

* More mass means more force is needed to produce the same acceleration.

* Greater acceleration means a greater force is acting on the object.

For example, a heavier object will require more force to push it to the same speed as a lighter object.