Sliders enable the selected surface to slide freely in all directions
within the plane and to rotate about the axis normal to the plane. In the
example below, a part face on the bottom of the block is parallel to the X-Y
plane. The slider allows motion only within that plane and will prevent any
motion in the Z-direction.
Click Play to watch the video:
You can select any planar surfaces as the geometry supports to which the
slider restraint is applied; cylindrical or curved surfaces are not allowed.