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TABLE 1-2 Supports for Rigid Bodies Subjected to Three-
Dimensional Force Systems

Types of Connection Reaction Number of Unknowns
(1) cable
One unknown. The
reaction is a force
which acts away from
the member in the
known direction of
the cable.

(2) smooth surface support
One unknown. The
reaction is a force
which acts
perpendicular to the
surface at the point of
contact.

(3) roller
One unknown. The
reaction is a force
which acts
perpendicular to the
surface at the point of
contact.

(4) ball and socket
Three unknowns. The
reactions are three
rectangular force
components.

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