Here's a breakdown:

* Unequal forces: This means there's a net force acting on the object. If forces are equal and opposite, they cancel each other out, resulting in no net force.

* Change in motion: This can be a change in speed, direction, or both.

* Object's motion: This refers to the object's velocity, which includes both speed and direction.

Newton's Second Law states:

> The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This can be expressed as the equation:

> F = ma

Where:

* F is the net force acting on the object

* m is the mass of the object

* a is the acceleration of the object

In simpler terms:

* When there is an unbalanced force (net force) acting on an object, the object will accelerate (change its motion).

* The larger the net force, the greater the acceleration.

* The heavier the object (greater mass), the less it will accelerate for a given force.