Acceleration

       Acceleration is defined as the rate or speed of something.  If a car is accelerating at 1m/s then in 10 seconds, it will be going 10m/s.  When something is accelerating, it means that it is constantly getting faster or slower as long as the acceleration is not zero.

        If I were to drop this ball, its acceleration would be 9.8m/s because that is the acceleration of gravity.  So after 2 seconds the ball will be accelerating at 19.6m/s.  This ball would continue to get faster and faster.