The rate at which velocity changes is called acceleration.
1. Acceleration is the measurement of how quickly an object's velocity changes over time.
2. It can be in the form of speeding up (positive acceleration), slowing down (negative acceleration or deceleration), or changing direction.
3. For example, when a car speeds up from a stoplight, it is experiencing acceleration.
4. Acceleration is a vector quantity, meaning it has both magnitude (how fast the velocity is changing) and direction (whether it is increasing or decreasing).
