https://se.mathworks.com/help/sm/ref/simscape.multibody.externalforcetorquedictionary-class.html
simscape.multibody.ExternalForceTorqueDictionary - Dictionary that stores external forces and...
Use an object of the simscape.multibody.ExternalForceTorqueDictionary class to store external forces and torques to apply to a compiled multibody model.
multibodydictionarystoresexternalforces