EPF Lecture Notes for Sections 3_1 - 3_3

EPF Lecture Notes for Sections 3_1 - 3_3 - EQUILIBRIUM OF A...

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EQUILIBRIUM OF A PARTICLE, THE FREE-BODY Today’s Objectives : Students will be able to : a) Draw a free body diagram (FBD), and, b) Apply equations of equilibrium to solve a 2-D problem.
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The crane is lifting a load. To decide if the straps holding the load to the crane hook will fail, you need to know the force in the straps. How could you find the forces? APPLICATIONS Straps
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For a spool of given weight, how would you find the forces in cables AB and AC ? If designing a spreader bar like this one, you need to know the forces to make sure the rigging doesn’t fail. APPLICATIONS (continued)
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APPLICATIONS (continued) For a given force exerted on the boat’s towing pendant, what are the forces in the bridle cables? What size of cable must you use?
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COPLANAR FORCE SYSTEMS (Section 3.3) To determine the tensions in the cables for a given weight of the cylinder, you need to learn how to draw a free body diagram and apply equations of equilibrium. This is an example of a 2-D or coplanar force system. If the whole assembly is in equilibrium, then particle A is also in equilibrium.
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THE WHAT, WHY AND HOW OF A FREE BODY DIAGRAM (FBD) Free Body Diagrams are one of the most important things for you to know how to draw and use. What
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EPF Lecture Notes for Sections 3_1 - 3_3 - EQUILIBRIUM OF A...

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