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

A uniform plank is supported by two equal 120 N forces at X and Y. The support at X is then moved to Z (halfway to the plank center).

The supporting force at Y then becomes?

_____________________________

X...........Z...........c......................Y

i tried to draw it above. The line is the plank, X and Y are the supports, Z is where X is moved to, and (c) is the center of the plank

3. The attempt at a solution

I came across this as i am studying for my test and i am a little lost.

The solution says to do this:

(240 N)(1/4L) = F_{y}(3/4L)

and the answer is 80 N

I am confused on where this solution comes from.

Any explaining would be very helpful :)

Thank you

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# Homework Help: Uniform plank - Supporting force

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