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free-body diagram is of primary importance for solving problems in
mechanics.
Support Reactions. Before presenting a formal procedure as to
how to draw a free-body diagram, we will first consider the various
types of reactions that occur at supports and points of contact between
bodies subjected to coplanar force systems. As a general rule:
• If a support prevents the translation of a body in a given
direction, then a force is developed on the body in that direction.
• If rotation is prevented, a couple moment is exerted on the
body.
a b
c d e
f g
Fig. 1-7.
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