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Definition: Average acceleration is the change in velocity over
the change in time:
Definition: Instantaneous acceleration is calculated by taking
shorter and shorter time intervals, i.e. taking
t 0:
Note:
 Acceleration is the rate of change of velocity.

When velocity and acceleration are in the same direction, speed increases with
time. When velocity and acceleration are in opposite directions, speed
decreases with time.

Graphical interpretation of acceleration: On a graph of v versus t , the
average acceleration between P and Q is the slope of the line between P and Q,
and the instantaneous aceleration at P is the tangent to the curve at P.
 From now on ``velocity'' and ``acceleration'' will refer to the
instantaneous quantities.
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10/9/1997