Using examples of riding in a car and experiencing the effect on you when the car begins to speed up from a stop, led into the working definition of acceleration. The "process of speeding up" was used as the initial definition. A more precise scientific definition was then introduced, as a rate in which velocity changes. The meaning and determination of velocity was reinforced at this point. Acceleration was expanded to refer to increasing speed, decreasing speed, or changing direction. The motion of a small single engine plane taking off from rest was used to calculate the acceleration. Starting at time zero, the speed at 1, 2 and 3 seconds was listed and the acceleration for the time interval determined by using the change in velocity/ total time.
Knowing the acceleration, the velocity at 4 sec. and 5 seconds could be calculated.