(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

this is a picture of an example from the book. im going off of it to solve a problem that will be on my test tomorrow. i can figure out how to calculate the shear force and moment of each section (though i dont fully understand it), but im just not getting how they decide on these sections. sorry for the crappy photo, all i have it my camera phone.

the sections are labeled like 0<x<4, 4<x<8 etc. but when they draw the 4<x<8 section in the example they include the 0<x<4 section....? why? and how come x changes with every section. thats confusing the hell outta me. oh and on the first section diagram to the left, how did they come up with (x/4)*100? and 12.5x^2?

thanx

http://img150.imageshack.us/img150/2323/staticsko8.th.jpg [Broken]

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Statics- beams internal effects i dont get it

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