Load
A Load applies a (usually constant) force, torque, mass-proportional or generalized load onto Nodes or Objects via Markers. The requested Marker
types need to be provided by the used text{Marker}. The marker may provide more types than requested. For non-constant loads, use either a load...UserFunction
or change the load in every step by means of a preStepUserFunction
in the MainSystem
(mbs).