(Flash) Simple gravity model - Math and (Quasi) physics in AS3

This is a simple model to demonstrate how to simulate gravity.

In this example, gravity is not mutual but the circle A is fixed in a place and the circle B flies around it under the effect of gravity. The product of the first three terms(G * m1 * m2) in the Newton's law is simplified and set to 10, which is enough for rough simulation like this.
Try dragging A to change the orbit of B.

Newton's law of universal gravitation (in AS3)

F = G * m1 * m2 / Math.pow(r, 2);

• F is the magnitude of the gravitational force between the two point masses
• G is the gravitational constant (6.674 × 10⁻¹¹ N m² kg^-2)
• m1 is the mass of the first point mass
• m2 is the mass of the second point mass
• r is the distance between the two point masses

See 'Newton's law of universal gravitation - Wikipedia' for more about law of universal gravitation.

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