- Acceleration can change the speed of an object by either increasing or decreasing it.

- e.g. a car accelerating from rest to 60 mph; a skydiver falling toward Earth.

2. Direction

- Acceleration can change the direction of an object's motion.

- e.g. a car turning a corner; a satellite orbiting the Earth.

3. Both Speed and Direction

- Acceleration can also change both the speed and direction of an object's motion.

- e.g. a car that is accelerating around a curve.