1.3 Mass--A Measure of Inertia


Paul distinguishes between mass and weight in a video from his classroom, then breaks strings attached to a ball in ways that clarify the distinction.

Distinguishing Mass, Weight, and Volume

Three very fundamental physical quantities are discussed: mass, weight, and volume. Mass and weight are not the same thing: while mass is the amount of matter, weight is a gravitational force. Volume is the region of space that an object may occupy. Duration: 10:17.

The Newton: A unit of force

A brief video lesson in which Hewitt defines a commonly used unit of force, which is the Newton. Duration: 0:38.