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by: Elena Camp

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# Exam 1 Study Guide EM 274

Elena Camp
ISU
Statics of Engineering

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Here is a study guide for Statics (EM 274). It contains all of the equations and concepts need for your first exam. Good luck! And good studying! I realize that I accidentally wrote EM 273 throu...
COURSE
Statics of Engineering
PROF.
TYPE
Study Guide
PAGES
3
WORDS
KARMA
50 ?

## Popular in General Engineering

This 3 page Study Guide was uploaded by Elena Camp on Sunday September 20, 2015. The Study Guide belongs to EM 274 at Iowa State University taught by Pradip Sagdeo in Fall 2015. Since its upload, it has received 527 views. For similar materials see Statics of Engineering in General Engineering at Iowa State University.

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Date Created: 09/20/15
EM 273 Statics Study Guide for Midterm 1 Professor Pradip Sagdeo Iowa State University Fall 2015 Important Concepts for the Exam 0 Magnitude unit vector and direction of cosines for a vector 0 Cartesian form and polar coordinates and being able to translate between them 0 Distinguish and solve for orthogonal and nonorthogonal components of a force 0 Dot and cross products 0 Free body diagrams o Moment of a force 0 Clockwise and counterclockwise forces in 2 dimensions Magnitude a b C 2 Va2 b2 C2 n J52 F F22 Unit Vector 1 unit 173C130quot 2 ml Direction of Cosines R A2 B2 ZABCOSQ A B R Sina SinB sine Cartesian and Polar Coordinates Cartesian Coordinates xy Polar Coordinates r6 Conversion equations x rcosQ y rsin l x2 y2 r M119 2 X x 2 Orthogonal V NonOrthogonal If you vectors are orthogonal then they are parallel When taking the dot product of two orthogonal vectors the product is zero Dot Product Cross Product 17 i3 Il llll llcose an 9 2 C05 1Il nnv7n acid 3 cub13 if al 2 allTlllllgllcosa J 5 zT TE k c f a 9 e f d f d e uxv abCXd f a h lquot blg iclg hl Cb wk i a d Il X 13H Il llll llsin l Free Body Diagrams When drawing a free body diagram first draw the outlined shape of the object as if it is isolated from its surroundings Second show all of the forces acting on the particle including the active and reactive forces Third identify each of the forces acting on the particle and make sure to label even the ones that are unknown Moment of a Force M0 M0 Fldl F2d2 F3d3 Fndn Clockwise V Counterclockwise wk When talking about a force you need to distinguish which way the force is going For this force blue arrow if we were to distinguish it using a positive angle we would use the counterclockwise direction green arrow However if we were to distinguish the force using a negative angle we would use the clockwise direction red arrow Most systems when they distinguish an angle they start at the positive xaxis and go counterclockwise green arrow in the positive direction unless specified otherwise

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