Inertia and Gravitational Force

This unit builds on previous lessons establishing ideas of the existence of inertia and gravitational force. It addresses two major objectives: the existence of inertia in space (and its dependence on mass) without gravitation and the ability to give a coherent explanation of events in which the inertial and the gravitational property must be considered simultaneously. The major case we will consider is the problem of why objects with unequal mass fall at the same rate.