If the force is perpendicular to the direction of motion (and the motion is constrained along that one direction), then that perpendicular gravity force often shows up as an increased friction force or side-loading force (the Y-directed gravity would create an increased friction force in the X-direction). This will depend on the types of constraints and mechanical assemblies within your system. The motion in Maxwell by default assumes motion in a single direction, so all the forces, damping, and motion are with respect to that single direction only.
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