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Centroids
Introduction
• The earth exerts a gravitational force on each of the particles
forming a body. These forces can be replace by a single
equivalent force equal to the weight of the body and applied
at the center of gravity for the body.
• The centroid of an area is analogous to the center of
gravity of a body. The concept of the first moment of an
area is used to locate the centroid.
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Centroids
• Centroid of mass
–(a.k.a. Center of mass)
–(a.k.a. Center of weight)
–(a.k.a. Center of gravity)
• For a solid, the point where the
distributed mass is centered
• Centroid of volume, Centroid of area
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