2020-03-25 18:53:35 +00:00
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# SIM_contact
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2020-03-25 18:07:15 +00:00
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SIM_contact simulates the motion, and the collisions of any arbitrary numbers of moving balls.
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Each ball is defined by a position, velocity, radius, and mass.
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Collisions are purely elastic. In addition to conserving momentum, they also conserve kinetic energy.
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A graphics client allows you to see the balls in motion:
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2020-03-25 18:53:35 +00:00
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## Examples
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2020-03-25 18:07:15 +00:00
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The configuration for the above display is:
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```
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dyn.contact.nballs = 2
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dyn.contact.balls = trick.TMM_declare_var_1d("Ball*", dyn.contact.nballs)
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dyn.contact.balls[0] = trick.make_Ball(0.0, 0.0, 0.5, 0.0, 0.5, 1.0)
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dyn.contact.balls[1] = trick.make_Ball(3.0, 0.0, -0.5, 0.0, 0.5, 1.0)
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```
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The initial state of the first ball is pos=<0.0, 0.0>, vel=<0.5,0.0>, radius=0.5, and mass=1.0.
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2020-03-25 18:53:35 +00:00
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The initial state of the second ball is pos=<3.0, 0.0>, vel=<-0.5,0.0>, radius=0.5, and mass=1.0.
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