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# ch3_1lecture - EQUILIBRIUM OF A PARTICLE IN 2-D Todays...

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EQUILIBRIUM OF A PARTICLE IN 2-D 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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APPLICATIONS For a spool of given weight, what are the forces in cables AB and AC ?
APPLICATIONS (continued) For a given cable strength, what is the maximum weight that can be lifted ?

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EQUILIBRIUM OF PARTICLE IN 2-D (Section 3.3) 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. To determine the tensions in the cables for a given weight of the engine, we need to learn how to draw a free body diagram and apply equations of equilibrium.
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 ? - It is a drawing that shows all external forces acting on the particle. Why ? - It helps you write the equations of equilibrium used to solve for the unknowns (usually forces or angles).

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How ?
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