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EQUATIONS OF EQUILIBRIUM & TWO AND
THREEFORCE MEMEBERS
Today’s Objectives:
Students will be able to:
a)
Apply equations of equilibrium to
solve for unknowns, and,
b)
Recognize twoforce members.
InClass Activities:
•
Check Homework, if any
•
Reading Quiz
•
Applications
•
Equations of Equilibrium
•
TwoForce Members
•
Concept Quiz
•
Group Problem Solving
•
Attention Quiz
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View Full Document READING QUIZ
1.
The three scalar equations
∑
F
X
=
∑
F
Y
=
∑
M
O
=
0, are ____
equations of equilibrium in two dimensions.
1)
incorrect
2)
the only correct
3)
the most commonly used
4)
not sufficient
2.
A rigid body is subjected to forces as
shown. This body can be considered
as a
______
member.
A) singleforce
B)
twoforce
C) threeforce
D)
sixforce
APPLICATIONS
For a given load on the platform, how can we determine the
forces at the joint A and the force in the link (cylinder) BC?
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View Full Document APPLICATIONS
(continued)
A steel beam is used to support roof joists.
How can we
determine the support reactions at each end of the beam?
EQUATIONS OF EQUILIBRIUM
(Section 5.3)
A body is subjected to a system of forces
that lie in the xy plane.
When in
equilibrium, the net force and net moment
acting on the body are zero (as discussed
earlier in Section 5.1).
This 2D condition
can be represented by the three scalar
equations:
x
y
F
1
F
2
F
3
F
4
O
∑
F
x
= 0
∑
F
y
= 0
∑
M
O
= 0
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This note was uploaded on 10/04/2010 for the course ME 214 taught by Professor Lipovetsky during the Summer '06 term at Cal Poly Pomona.
 Summer '06
 Lipovetsky
 Statics

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