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

Two plasterers Bill and Dave of mass 45kg and 65kg respectively stand on a unofrm plan ABCDEF of length 4m and mass 40kg. The plank is supported at C and E where C is 1m from A and E is 1m from F. Plasterer Bill stands at B which is 0.5m from A and plasterer Dave stands at D which is 1.5m from F.

a) Draw a diagram showing the above information

b) Find the reaction at each support, giving your answers in N to 1 decimal place.

2. Relevant equations

http://img164.imageshack.us/img164/9263/drawnqf5.jpg [Broken]

I drew this on paint, seems to be correct. Thats a) done.

3. The attempt at a solution

The question dosen't state anything about Equilbirum, but heres what I done:

m(R):

0.5 x 45g + S = 40g + 1.5 x 65g

S = 40g + 97.5g - 22.5g

S = 1127N

Sub this into:

S + R = 150g

R = 150g - 1127

R = 343N.

However they are both completly wrong, I assume I am going wrong with thinking it is in equilbrium. Since it isn't, I'm not too sure on where to start.

Any hints/help is very appreciated =)!

Thank you.

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# Basic Moments Question

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