Optional
Readonly
dampingDamping, how much to reduce velocity. Default 0.995 (ie 0.5% loss)
Optional
Readonly
lengthLength of 'string' thing is hanging from. If undefined, the current length between thing and pinnedAt is used.
Optional
Readonly
speedMax speed of swing. Slower speed can reach equilibrium faster, since it might not swing past resting point. Default 0.001.
Pendulum force options