FRIENDS
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Lines are Fnet vectors.

Properties:
• Force attract based on distance
• Acceleration based on Force and mass (F=ma)
• Velocity based on Acceleration (V = v + at)
• Position based on velocity and time step (S = s + Vt + 1/2 at^2)

The textbox manipulates the number of meters per pixel, and hence the distance scale of the model. Push enter to enter a new value, enter to display current value.
Try very small values.
part1 part2 part3 part4 part5 part6