Average acceleration is the rate at which velocity changes: –a=ΔvΔt=vf−v0tf−t0, where −a is average acceleration, v is velocity, and t is time. (The bar over the a means average acceleration.)
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Because acceleration is velocity in
m/s divided by time in s, the SI units for acceleration are m/s2, meters per second squared or meters per second per second, which literally means by how many meters per second the velocity changes every second.
Recall that velocity is a vector—it has both magnitude and direction. This means that a change in velocity can be a change in magnitude (or speed), but it can also be a change in direction. For example, if a car turns a corner at constant speed, it is accelerating because its direction is changing. The quicker you turn, the greater the acceleration. So there is an acceleration when velocity changes either in magnitude (an increase or decrease in speed) or in direction, or both.
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