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Week6_1 - draw ENGR210 Fall 2011 3 “Support...

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ENGR210, Fall 2011 1 Ch. 5 Equilibrium of a rigid body 5.1 Conditions for rigid-body equilibrium A rigid body in static equilibrium: The resultant force acting on the body is zero. The resultant moment about a point O is zero.
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ENGR210, Fall 2011 2 5.2 Free body diagram It is essential to understand how to draw FBDs. (You already know this.) Identify a coordinate system. Isolate a body from surroundings. All forces and moments acting on the body have to be included. o Unknown forces and moments have to be labeled appropriately. All necessary dimensions have to be included with units. The equilibrium equations need to be consistent with the FBD. (In other words, you write equilibrium eqns using the FBD you
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Unformatted text preview: draw.) ENGR210, Fall 2011 3 “Support reactions” (important!) Understanding support reactions is important in order to draw FBDs, because these are forces and moments acting on a rigid body that support the body. Generally, support reactions are the forces/moments preventing the body from moving in specific directions. If a support prevents the translation of a body in a given direction, then a force (support reaction force) is developed on the body in that direction. If rotation is prevented, a couple moment is exerted on the body. The direction of reaction forces or couples in a FBD (i.e., the arrow-direction) is arbitrary....
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