2.2 Newton’s Second Law of Motion

Free Fall

The ratio of an objects weight to mass is always the same, which explains how all freely falling objects fall with the same accelertion. Duration: 9:28.

Acceleration Less Than "g"

Hewitt uses the example of two parachutists to explain the effect of wind resistance upon a falling object. Duration: 5:52.

Force Causes Acceleration

Examples are provided to show how acceleration is directly related to force and inversely related to mass. Duration: 4:15.


The role friction plays within cases of dynamic equilibrium is highlighted. Duration: 6:58.

Newton's Second Law of Motion

The acceleration of an object is directly proportional to the net force on that object and indirectly proportional to the object's mass. Duration: 2:36.