I am cerious how to calculate a simple 2 point moment using the formula Mm dx/EI Lets say i have a span of 43 1/2" with 2 5000lb loads 10 3/4" from each side. Each side is simply supported. My inertia of my beam is 4 I have drawn a moment diagram but i cant seem to translate it to diflection. I know that M represents moment. My first moment is 5000*10 3/4 = 500011 lb-in. So with the formula above i can calculate a deflection at any point. This is where i get lost. I read that m is the unit load where i want to calculate my deflection. I suspect that would be 5000lbs? What is dx in this equation? Obviously E for steel is 3.0x10^8 psi. I listed above as 4 I would appreciate it if someone could enlighten me on this formula. This is a simple calc and can be done other ways, I just want to be familar with this formula so i can use it on more adavanced calcs. Thank you all!