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
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?
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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