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.

The Newton: A unit of force

This brief video lesson shows Hewitt defining a commonly used unit of force, which is the Newton. Duration: 0:38.

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.

Physics, The Basic Science

Physics is the study of the rules of nature and is foundational to other sciences, such as chemistry and biology. Duration: 1:38.