The class was started with a few review questions regarding hypothesis and law. Some demonstrations of thermal and mechanical equilibrium were used and a definition derived for equilibrium. Using spring balances and a large wooden block and masses, it was shown that a force is applied to change the equilibrium. The states of motion, rest and movement, were both shown to need a force to change their state of motion. The definition of a force was elicited. Examples were drawn on the board to show the derivation of a net force, and that the unit of force measurement is the Newton (N). The stretching of the spring in the balance was noted and named the "stretching force" which is referred to as tension. The formula for determining the weight as weight=force of gravity x mass was given and the force of gravity (g) shown as 9.8 Newtons.