Find out how the gravitational field strength is directly related to the mass of the object and indirectly related to the square of the distance from the center of mass. [5:38]

Award-winning science teacher Paul Andersen helps make physics understandable as he explains how gravitational forces differ from the other three fundamental forces: electromagnetic, and strong and weak nuclear forces. [5:05]

A video tutorial explaining the physics behind the gravitational force of an object at rest. [3:46]

Viewing g as the value of Earth's gravitational field near the surface, rather than as the acceleration due to gravity near Earth's surface for an object in freefall. [7:30]

This lesson demonstrates how to determine the gravitational force acting on an object. It is 1 of 2 in the series titled "Calculating Gravitational Force." [3:49]