Here's a breakdown:

* Unbalanced Force: A force that causes a change in an object's motion. If forces on an object are balanced, they cancel each other out and the object stays at rest or continues moving at a constant velocity.

* Mass: A measure of the amount of matter in an object.

* Acceleration: The rate of change of velocity. It means how quickly an object is speeding up, slowing down, or changing direction.

The formula:

F = m * a

Where:

* F is the net force (the sum of all unbalanced forces)

* m is the mass of the object

* a is the acceleration of the object

In simpler words: The more force you apply to an object, the more it will accelerate. And the heavier the object (the more mass it has), the less it will accelerate for a given force.