- The vector or cross product is another way to combine two vectors; it creates a vector perpendicular to both it the originals.
- The angular momentum of a body depends on the point chosen as the origin.
- The angular momentum of a body around a point is the cross product of the radius from the point to the body and the momentum of the body.
- Angular momentum is the rotational analog of linear momentum
- Just as the time derivative of linear momentum is force, the time derivative of angular momentum is torque.
- The angular momentum around a point of a body which moves directly towards that point is zero.

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Jack and Jill go to the carnival and ride the "Whirl-A-Kid."

1: What is the moment of inertia of Jack around the hub? 2: What is the moment of inertia of Jill around the hub? 3: What is the moment of inertia of one arm? 4: What is the moment of inertia of both arms? 5: What is the angular momentum of Jack? 6: What is the angular momentum of Jill? 7: What is the angular momentum of one arm? 8: What is the angular momentum of both arms? 9: What is the total angular momentum of Jack, and Jill, and both arms of the Whirl-a-Kid?

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