Week7_2 - ENGR210, Fall 2011 1 ENGR210, Fall 2011 5.5...

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ENGR210, Fall 2011 1
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ENGR210, Fall 2011 2 5.5 Free-body diagrams in 3D systems “Support reactions” 3D support reactions are listed in Table 5-2. You need to memorize them. Memorization may not be so difficult if you understand how each connection works. For example, a ball-and- socket joint is allowed to rotate freely about the joint but no translations are allowed. So, 3 translational support reactions (i.e., forces) are applied to prevent the translational motion.
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ENGR210, Fall 2011 3 Fx, Fy and Fz are support reaction forces (unknowns) (4 unknowns)
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ENGR210, Fall 2011 4 (5 unknowns) (5 unknowns)
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ENGR210, Fall 2011 5 (5 unknowns) (5 unknowns)
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ENGR210, Fall 2011 6 (6 unknowns)
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7 The joints (5) – (9) on Table 5-2 provide both force and couple moment reactions by themselves. However, if these supports are used in conjunction with other supports, no couple moment reactions are applied in general. (Example)
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Week7_2 - ENGR210, Fall 2011 1 ENGR210, Fall 2011 5.5...

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