Review of speed and velocity, scalar, and vector quantities. Use an example of a moving object, like a car, traveling at constant velocity. Ask about the acceleration, and elicit that there is no acceleration, and why. Define acceleration as a change in velocity. Add to that definition that it also is a rate, therefore needs a time element. Extend the definition to read a change in velocity per unit of time. From a drawing of a car traveling at a constant speed in a circle, inquire if the car is accelerating. Discuss that acceleration also can involve a change in direction.
Rewrite the definition to include change in velocity or direction per unit of time. Change in velocity is velocity final - velocity initial. Write the formula as a= final velocity-initial velocity/time. Present the sample problems, solve them together and then present the application problems to be solved by Baylie.