1. Change in Speed:

* Acceleration: This is the most common way velocity changes. When an object speeds up or slows down, its velocity changes.

* Deceleration: This is a specific type of acceleration where the object slows down.

2. Change in Direction:

* Turning: Even if an object maintains a constant speed, changing direction means its velocity is changing. Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.

3. Change in Both Speed and Direction:

* Curved paths: Objects moving in a curve, like a car going around a corner, are constantly changing both their speed and direction, resulting in a changing velocity.

Examples:

* A car accelerating from a stoplight.

* A ball rolling down a hill.

* A plane landing on a runway.

* A satellite orbiting Earth.

Key takeaway:

Velocity changes whenever there is a change in speed, direction, or both.