Posted by **collegechick306** on Thursday, July 28, 2011 at 6:47pm.

A 3.0-m-long rigid beam with a mass 130 kg is supported at each end. An 90 kg student stands 2.0 m from support 1.

How much upward force does support 1 exert on the beam?

How much upward force does support 2 exert on the beam?

- Physics -
**drwls**, Thursday, July 28, 2011 at 7:09pm
Becasue vertical frce must balance,

F1 + F2 = (M1 + M2)* g

M1 is the beam mass. M2 is the student's mass.

F1 is the force on support 1.

F2 is the force on support 2.

Now write a moment balance equation, such as.

M2*g*2 + M1*g*1.5 = F2*3

You can solve the last equation for F2 directly. Then use the first equation to solve for F1.

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