#### ACCELERATION, is the rate at which a velocity changes. There are two principal types of acceleration, linear acceleration and angular acceleration.

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### Linear Acceleration.

A linear velocity, measured for example in miles per hour (mph) or meters per second (m/sec), can change in amount or magnitude, or it can change in direction. Either of these changes in linear velocity produces a linear acceleration, measured for example in meters per second per second ($\displaystyle m/{{\sec }^{2}}$). Thus, an automobile travelling in a given direction experiences a linear acceleration whenever it speeds up or slows down. The same automobile, when driven around a curve, also experiences a linear acceleration by virtue of the change in its direction of motion.