ENGR210, Fall 2011
1
What is statics?
Deals with the equilibrium of
bodies
that are subjected to the action of
forces.
Use
F
ree B
ody D
iagrams
(FBD) frequently to solve for forces acting
bodies (
FBD is a
very
important tool
for mechanical engineering).
From FBDs, develop
equilibrium equations
and solve for unknowns.
The bodies are at rest or move with a constant velocity (i.e., no
accelerations <>
Dynamics
)
“Bodies”
Particle:
A particle has a mass, but its size can be neglected. So, the
geometry is not involved in the analysis.
Rigid body
: A rigid body can be considered as a combination of a large
number of particles in which all the particles remain at a
fixed
distance one
another (i.e., no deformation). The geometry is involved in the analysis.
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ENGR210, Fall 2011
2
“Significant figures”
The number of significant figures contained in any number determines the accuracy of the
number.
Example:
o
2.3 > two significant figures
o
0.0582 > three significant figures
o
4.321 (10
3
) > four significant figures
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 Fall '08
 KO
 Statics, Addition, Force, Euclidean vector, FBD

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