Linear acceleration: This is the change in the velocity of an object in a straight line. It can be positive (speeding up) or negative (slowing down).

Radial acceleration: This is the change in the speed of an object moving in a circle. It is always directed towards the center of the circle.

Angular acceleration: This is the change in the angular velocity of an object rotating about an axis. It can be positive (speeding up) or negative (slowing down).