An axial force is similar to a spring because it produces a translational force between two points on two bodies, but a function expression is used to control the magnitude of the force rather than coefficients or a spline curve. When the value of the axial force is positive, the axial force acts to separate the two bodies. When the value of the axial force is negative, the force acts to bring the two bodies together.
Figure 1 Axial Force and Rotational Axial Force
Figure 2 Axial icon of the Force group in the Professional tab