It might seem surprising that a particle moving

Conservation of angular momentum L = r X m v

Kepler's second law states:

Does a free particle moving in a straight lines

Press start to start the animation, and let the show begin

A black will move freely from left to right.

Does all the areas have the same size?

Click within each area and see what will happen.

Certainly, from mathematic equation, we know

Your suggestions are highly appreciated!

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AuthorGFu-Kwun Hwang, Dept. of physics, National Taiwan Normal University
Last modified :