1. Changing the speed:

* Acceleration: Applying a force to an object can cause it to speed up (positive acceleration) or slow down (negative acceleration, also called deceleration).

* Example: Pushing a cart makes it go faster, while applying brakes to a car slows it down.

* Changing the direction:

* Example: A car turning a corner maintains its speed but changes its direction, therefore changing its velocity.

2. Changing the direction:

* Turning: Any change in direction, even without a change in speed, will change the velocity.

* Example: A ball thrown in a perfect arc changes direction continuously due to gravity, even if its speed remains constant.

Important notes:

* Velocity is a vector quantity: It has both magnitude (speed) and direction.

* Acceleration can change both speed and direction: If a force is applied at an angle to the object's motion, it can cause both a change in speed and a change in direction.

In summary, velocity can be changed by:

* Increasing or decreasing speed (acceleration or deceleration)

* Changing direction

* Combining both acceleration and a change in direction