I´ve prepared a simple example KangarooTest.gh (51.9 KB) to figure out what units are used in the Strength input of the Length(Line) and Angle goal components. It consist of two lines initially at 90º with one anchor point in common (point “0”). By selecting None, One or Two in the Value List component from the yellow group, you can switch between three models, i.e. fix either no point, point “1” or point “2”, respectively.
For the Length(Line) goal it is evident that the Strength input corresponds to the stiffness constant of a simple linear spring with the units in [Newton/meter]. You can check in the gray group panels that the Strength input value is recovered by dividing the Force by the Length increment for all models.
For the Angle goal I´m a bit confused. Shouldn´t the Strength input correspond to a torsional stiffness? In the white group, I divide the Momentum by the angular increment in radians and I obtain a smaller torsional stiffness than expected. For example, feeding 100 to the Strength input of the Angle goal component, a value of 68.66 is recovered upon dividing the Momentum by the angle increment.
Would you help me to find what are the units of the Angle goal Strength input? I must be missing something key in my derivation… Thank you very much!