chapter 4-2

# chapter 4-2 - MOMENT ABOUT AN AXIS(Section 4.5 Today's...

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1 MOMENT ABOUT AN AXIS (Section 4.5) Today’s Objectives : Students will be able to determine the moment of a force about an axis using a) scalar analysis, and b) vector analysis. In-Class Activities : Check Home work, if any Reading quiz Applications Scalar analysis Vector analysis Concept quiz Group problem solving Attention quiz READING QUIZ 1. When determining the moment of a force about a specified axis, the axis must be along _____________. A) the x axis B) the y axis C) the z axis D) any line in 3-D space E) any line in the x-y plane 2. The triple scalar product u • ( r × F ) results in A) a scalar quantity ( + or - ). B) a vector quantity. C) zero. D) a unit vector. E) an imaginary number.

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2 APPLICATIONS With the force F , a person is creating the moment M A . What portion of M A is used in turning the socket? The force F is creating the moment M O . How much of M O acts to unscrew the pipe? VECTOR ANALYSIS Our goal is to find the moment of F (the tendency to rotate the body) about the axis a’-a.
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## This note was uploaded on 09/19/2009 for the course ME 241 taught by Professor Itani during the Spring '08 term at Nevada.

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chapter 4-2 - MOMENT ABOUT AN AXIS(Section 4.5 Today's...

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