ME 214 Vector Statics
Week 2
Lecture 5, Chapter 2
Instructor: A Rezaei
Today’s Objective: Students will be able to:
a) Draw a free body diagram (FBD), and,
b) Apply equations of equilibrium to solve a 2D problem.
Important Note: Free Body Diagram is one of the most important topics in
understanding the basic
concepts
in STATICS, do yourself a favor
and LEARN
HOW TO DRAW
FBD
(Free Body Diagrams) correctly
.
If you do not draw
the FBD correctly, there is no way you will be doing a STATICS
problem
correctly.
THE WHAT, WHY AND HOW OF A FREE BODY DIAGRAM (FBD)
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).
How
?
1.
Imagine the particle to be isolated or cut free from its surroundings.
2.
Show all the forces that act on the particle.
Active forces: They want to move the particle.
Reactive forces: They tend to resist the motion.
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 Summer '06
 Lipovetsky
 Statics, Force, FBD

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