[PDF] angular momentum

Overview

Review how both rotating objects and objects with linear momentum can have angular momentum. Recap how torque applied to and object over a time interval can change the angular momentum of an object.

How to find the angular momentum of an object moving in a straight line

People forget that an object moving in a straight line (having linear momentum) can have angular momentum. For example, let’s say we throw a ball at one end of a stick (see Figure 1). The stick can pivot around point OOOO. When the ball hits the stick, the stick rotates.

Common mistakes and misconceptions

People mistakenly think any external force acting on a system will change angular momentum. Angular momentum is changed by a net external torque, but not all forces cause a torque. To produce a torque ?tau?tau, a force FFFF must have a lever arm rrrr and a component perpendicular to the lever arm.

Learn more

For deeper explanations of angular momentum concepts, see our video about angular momentum and impulse.

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