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

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

(7) pin connected to collar on smooth rod
One unknown. The
reaction is a force which
acts perpendicular to the
rod.

Two unknowns. The
(8) smooth pin or hinge reactions are two
components of force, or
the magnitude and
direction of ψ the
resultant force. Note that
or ψ and θ are not
necessarily equal.
(9) fixed connected to collar on smooth rod
Two unknowns. The
reactions are the couple
moment and the force
which acts perpendicular
to the rod.

(10) fixed support Three unknowns. The
reactions are the couple
moment and the two force
components, or the couple
moment and the
magnitude and direction φ
or of the resultant force.

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