A free-body diagram for a tire swing held at rest includes the force of gravity and the normal force.
A free-body diagram is used to represent the forces acting on an object.
For a tire swing held at rest, the free-body diagram will include the force of gravity acting downwards at the center of mass of the tire, and the normal force exerted by the support holding the tire swing in place.
Since the tire swing is held at rest, there is no motion, so the net force on the tire swing should be zero.
Other forces like air resistance or friction can be ignored in this scenario. The free-body diagram for a tire swing held at rest will only include the force of gravity and the normal force.