ME 221Lecture 141 ME 221 Statics Lecture #14 Section 4.3

ME 221Lecture 142 Homework #5 Chapter 3 problems: –48, 51, 55, 57, 61, 62, 65, 71, 72 & 75 –May use MathCAD, etc. to solve –Due Friday

ME 221Lecture 143 Homework #6 Chapter 4 problems: –2, 4, 10, 11, 18, 24, 39, 42, 43 & 47 –Must use integration methods to solve –Due Wednesday, October 8

ME 221Lecture 144 Quiz #4 Monday, October 6 Exam #2 Friday, October 10

ME 221Lecture 145 Last Lecture: The concepts of distributed loads, centroids and center of gravity were presented.

ME 221Lecture 146 Centroid of an Area Geometric center of the area –Average of the first moment over the entire area –Where:

ME 221Lecture 147 Centroid of an Area Is then defined as an integral over the area. Integration of areas may be accomplished by the use of either single integrals or double integrals.

ME 221Lecture 148 Centroid of a Volume Geometric center of the volume –Average of the first moment over entire volume –In vector notation:

ME 221Lecture 149 Examples