Universal Gravitation


Outline
This is a simulation of how 3 or less matter moves in the universe according to universal gravitation. If there was an object with a weight and velocity at a certain place in the universe, and if there was no external force, it moves like this simulation. Drag the object to a place with a mouse, and set its weight and velocity using the scroll bar on the right, or press random. Then if you press the start button, the simulation will begin. If you press motion, it simulates by indicateing the locus of the motion.
Screen Explanation
Start	Starts the simulation with the set terms.
Stop	Stops the simulation.
Motion	Starts the simulation with the set terms and indicates its locus.
Replay	It restores previous simulation and makes the replay possible.
Random	It sets a place and weight randomly. It will not set a velocity.
Reset	It neutralizes the condition back to the beginning.
Velocity x,y	It sets each object's starting velocity.
Weight	It sets each object's weight. If you do not want to add an object to the simulation, please set its weight as 0.
Wait	It sets the speed of the simulation. If the number is small, it becomes faster, but it becomes less accurate.
Drag the object with a mouse	It sets the first position of the objects.
Use
The simulation finishes when 3 objects crash or the object's coordinates reach over 1000. When a blue and red object crash, it becomes purple. Blue and green becomes aquamarine, red and green becomes yellow. The object's coefficient of restitution is zero, and the objects do not rebound after crashing. The present coordinates of each objects will be shown in the text box below. The numbers next to the scroll bar gets renewed as simulation continues and the object's condition changes.
Error
In order to assure use of this simulation in general computers, there is a possibility of a minute error. Please keep this in mind.