The FM function returns the magnitude of the net translational force acting at marker i. All force and constraint elements between markers i and j are included in the calculation of the force, unless a force is an action-only type. To return the magnitude of the action-only forces acting at marker i, you should omit the specification of marker j or specify it to be zero.
FM(i[,j])
| i | An integer that specifies the identifier of the marker at which the magnitude of the net force is to be calculated. |
| j | A second integer that specifies a marker identifier. All forces acting between the [i,j] pair are included in the calculation. Set j = 0 or do not specify it if you are interested in action-only forces. |
FM(23)
The value of the function is the magnitude of the sum of all action-only forces acting at Marker 23.
FM(23,11)
The value of this function is the magnitude of the sum of all forces at Marker 23 and acting between Markers 23 and 11.