Discuss Newton's second law dealing with force and acceleration . Discuss how forces will cause accleration. Discuss unbalanced forces acting on an object. Elicit that net force accelerates an object. Discuss that acceleration is directly proportional to net force and inversely proportional to mass. An increase in mass results in a decrease in acceleration. Elicit the formula to show that acceleration = force /mass. Present a few problems to be solved in the class.