This information is part of the Modelica Standard Library maintained by the Modelica Association.

The 3 signals of the force connector are interpreted as the x-, y- and z-coordinates of a force acting at the frame connector to which frame_b of this component is attached. Via parameter resolveInFrame it is defined, in which frame these coordinates shall be resolved:

Types.ResolveInFrameAB.	Meaning
world	Resolve input force in world frame
frame_a	Resolve input force in frame_a
frame_b	Resolve input force in frame_b (= default)
frame_resolve	Resolve input force in frame_resolve (frame_resolve must be connected)

If resolveInFrame = ResolveInFrameAB.frame_resolve, the force coordinates are with respect to the frame, that is connected to frame_resolve.

If force={100,0,0}, and for all parameters the default setting is used, then the interpretation is that a force of 100 N is acting along the positive x-axis of frame_b.

Note, the cut-torque in frame_b (frame_b.t) is always set to zero. Additionally, a force and torque acts on frame_a in such a way that the force and torque balance between frame_a and frame_b is fulfilled.

An example how to use this model is given in the following figure:

This leads to the following animation (the yellow cylinder characterizes the line between frame_a and frame_b of the Force component, i.e., the force acts with negative sign also on the opposite side of this cylinder, but for clarity this is not shown in the animation):

animation	Value: true Type: Boolean Description: = true, if animation shall be enabled
resolveInFrame	Value: Modelica.Mechanics.MultiBody.Types.ResolveInFrameAB.frame_b Type: ResolveInFrameAB Description: Frame in which input force is resolved (1: world, 2: frame_a, 3: frame_b, 4: frame_resolve)

connectionLineDiameter	Default Value: world.defaultArrowDiameter Type: Diameter (m) Description: Diameter of line connecting frame_a and frame_b
forceColor	Default Value: Modelica.Mechanics.MultiBody.Types.Defaults.ForceColor Type: Color Description: Color of force arrow
connectionLineColor	Default Value: Modelica.Mechanics.MultiBody.Types.Defaults.SensorColor Type: Color Description: Color of line connecting frame_a and frame_b
specularCoefficient	Default Value: world.defaultSpecularCoefficient Type: SpecularCoefficient Description: Reflection of ambient light (= 0: light is completely absorbed)