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December 21, 2014

December 21, 2014

Posted by **Anonymous** on Sunday, November 4, 2007 at 11:55pm.

I Know that the total forces and torque needs to be zero. torque = r*F, but I don't know what needs to go where in the equation

- physics -
**drwls**, Monday, November 5, 2007 at 1:14amTo do this problem, you need to know where the two supports are located. Is one of them at the extreme opposite end of the board from where the person is standing?

Write two equations for the force exerted by the two supports. One of them is a force balance:

F1 + F2 = (Mb + Mp)

where Mb = board mass

Mp = person's mass

g = acceleration of gravity

The other equation is a moment balance equation. Although one can calculate the moment about any point and set it equal to zero, the problem will be simpler if you apply it at one of the support points. Then the moment due to one of the support forces will be zero, and you can solve for the other one right away.

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