# Deflection of Beams - Rearrange formula

by MikeNZ
Tags: beam, deflection, force, formula, rearrange
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 P: 8 1. The problem statement, all variables and given/known data Deflection for a simply supported beam... I calculated the deflection of it to be 9.72mm downwards, but there is a support 6mm from the original position and need to calculate the force on the support... The original formula for deflection is: y = - (F x L^3)/(48 x E x I) where 'x' is just the multiplication symbol. 2. Relevant equations y = - (F x L^3)/(48 x E x I) 3. The attempt at a solution To find the force on the support, I went 9.72-6 = 3.72mm I substituted 3.72 into the equation above as 'y', now, how do i rearrange the formula to find F? My attempt: F = (48 x E x I)/(Y x L^3) I get 2.212 MPa, this surely can't be right as the original load on top is 80KN. Did I rearrange correctly? 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution
 Sci Advisor HW Helper PF Gold P: 6,048 Is this a beam on 3 supports?
 P: 8 Simply supported, no, not 3 supports, doesn't matter I've figured it out now. Thanks.

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