CEE/ME 241
Lecture Notes for Section 9.19.2
1
CENTER OF GRAVITY AND CENTROID (Chapter 9)
Today’s Objective
:
Students will:
a)
Understand the concepts
of center of
gravity, center of mass, and centroid.
b)
Be able to
determine the location
of
these points for a system of particles
or a body.
InClass Activities
:
•
Check homework, if any
•
Reading quiz
•
Applications
•
Center of gravity, etc.
•
Determine their location
•
Concept quiz
•
Group problem solving
•
Attention quiz
READING QUIZ
1.
The
_________ is the point defining the
geometric center
of an object
.
A)
center of gravity
B)
center of mass
C) centroid
D)
none of the above
2.
To study problems concerned with the motion of matter
under the influence of forces, i.e., dynamics, it is necessary
to locate a point called
________.
A) center of gravity
B)
center of mass
C) centroid
D)
none of the above
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Lecture Notes for Section 9.19.2
2
APPLICATIONS
To
design the structure
for
supporting a water tank, we will
need to know the weights of the
tank and water as well as the
locations where the resultant
forces representing these
distributed loads are acting.
How can we determine these
weights and their locations?
APPLICATIONS
(continued)
One concern about a sport utility
vehicle (SUVs) is that it might tip
over while taking a sharp turn.
One of the important factors in
determining its stability is the
SUV’s
center of mass
.
Should it be higher or lower for
making a SUV more stable?
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 Spring '08
 ITANI
 Statics

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