After selecting a Load type, the Load list normally only contains User defined. When combining with another physics interface that can provide this type of load, it is also possible to choose a predefined load from this list.
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For Total force COMSOL Multiphysicsdivides the total force by the volume of the domains where the load is active. For 2D components, and if Force per unit area is selected, the body load as force per unit volume is then the value of F divided by the thickness.