Optional
Readonly
accelerationAcceleration vector. Most applied forces will alter the acceleration, culminating in a new velocity being set and the acceleraton value zeroed
Optional
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angleOptional
Readonly
angularOptional
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angularOptional
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massMass. The unit is undefined, again best to think of this being on a 0..1 scale. Mass is particularly important for the attraction/repulsion force, but other forces can incorporate mass too.
Optional
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positionPosition. Probably best to use relative coordinates
Optional
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velocityVelocity vector. Probably don't want to assign this yourself, but rather have it computed based on acceleration and applied forces
Basic properties of a thing that can be affected by forces