The unit system in a simulation is based on the length units of the current Rhino document and follow the following table:

Derived units such as acceleration, torque, and density are consistent within each unit system.

• Linear acceleration units are length/s²
• Torque units are force·length
• Density units are mass/length³

Across the several unit systems, the rotational units are the same. Namely:

• Rotational velocity units are rad/s
• Rotational acceleration units are rad/s²