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211bookmark2009 - ME 211/212 Statics/Dynamics ME 211/212...

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ME 211/212 Statics/Dynamics A free body diagram (FBD) is a pic- torial representation of the equations of motion (equilibrium). The word ”free” implies all the supports have been removed from the body and re- placed with the loads those supports exert. The FBD is arguably the most impor- tant tool of statics and dynamics. It is used in many courses beyond just statics and dynamics. Free Body Diagram (FBD) 1. Study the given body, ma- chine or frame and iso- late the portion of interest. That is, what you want to analyze. 2. Draw an outline of this isolated portion which has been cut from its bound- ary conditions or attach- ment features. Make your FBD as close to scale as you possibly can, and di- mension and label perti- nent angles and lengths. 3. Draw the coordinate sys- tem that will be used in writing out the equations of motion. 4. Draw and label all external contact and body forces at the point of application with an accurate depiction of the line of action. The ability to produce a proper free body diagram, as described above, is an essential skill for Cal Poly engineers. ME 211/212 Statics/Dynamics A free body diagram (FBD) is a pic- torial representation of the equations of motion (equilibrium). The word ”free” implies all the supports have been removed from the body and re- placed with the loads those supports exert. The FBD is arguably the most impor- tant tool of statics and dynamics. It is used in many courses beyond just statics and dynamics.
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