An object is said to have accelerated motion when its velocity changes over time. Velocity is a vector quantity, which means that it has both magnitude (speed) and direction. So, if an object's speed changes, its direction changes, or both, then it has accelerated motion.

The acceleration of an object can be calculated by dividing the change in velocity by the change in time. The SI unit of acceleration is meters per second squared (m/s^2).

There are many different ways to accelerate an object. Some examples include:

* Applying a force to the object

* Changing the object's mass

* Changing the object's surface area

When an object is accelerating, its momentum also changes. Momentum is a vector quantity that is defined as the product of an object's mass and velocity. So, if an object's mass or velocity changes, then its momentum also changes.

The rate of change of momentum is called impulse. Impulse is a vector quantity that is defined as the product of a force and the time over which the force is applied. So, if a force is applied to an object for a longer period of time, then the impulse is greater and the object's momentum will change more.