A series of demonstrations is used in determining the amount of fore needed to produce motion from various masses at rest. It is shown that the greater the mass, the greater the inertia, due to a greater mass requiring a stronger force to overcome the inertia. "Mass is a measure of inertia" Demonstrate that mass and volume are different measures, by demonstrating a large volume of cotton with a small mass and a small volume of metal with a large mass. Define mass and volume, the units used identify each and how to determine the weight of a substance knowing its mass and the acceleration due to gravity