Acceleration by definition is the speed at which an object changes its velocity. When a car is driving down south on the highway at 60 miles per hour and then the car speeds up to 70 miles per hour, this is an example of acceleration. Acceleration can also be measured by a simple formula. Also, here's a video to help you understand this formula. There are three types of acceleration: speeding up, slowing down, and changing direction.
Now that we know what acceleration is, let's learn the difference between positive and negative acceleration. One way to accelerate is to accelerate positively. This means that an object speeds up. An example of this is a kid on a skate board ramp. On the ramp, the kid is not moving, but when he starts to go down the ramp, he accelerates positively, or speeds up. Another type of acceleration is negative acceleration. This is when an object decelerates (or slows down its acceleration). If a car dives at 60 miles per hour, but then slows down to 50 miles, it has decelerated.
Finally, lets learn how acceleration is graphed. The X axis of the graph is reserved for time. The Y axis displays intervals of acceleration. The line on the graph represents the acceleration of the object. A U shape of a graph represents positive acceleration, a n shape on a graph represents a decrease in acceleration, and a straight line represents no change in acceleration.
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