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

Ok so I have a beam with the forces shown below. There is a 3 m span between the supports (A&B) and both of the supports are 1.5 m from the end of the beam. The 60 lb force is .75 meters left of support A and .75 m from the left end of the beam. P is an unknown force which I must solve for at the right end of the beam. I am allowed 33.75 lb on the left support and 93.75 lb on the right (this came from a stress equation I'm pretty confident those numbers are right).

2. Relevant equations

No real relevant equations except moment and force.

3. The attempt at a solution

So the force at A should be described by the moment around B divided by the distance from B to A. Thus giving a beam where the moment forces are zero.

FA=(P*1.5-60*3.75)/3

Then force B can be related to A because the forces in the y direction must be zero or the beam would move

Thus FB=(60+P)-FA or FB=(60+P)-(P*1.5-60*3.75)/3

I've tried plugging in the maximum forces for both but I can't seem to get an answer that works for both supports.

If you guys could help me or even steer me in the right direction that would be great.

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Beam support force question

**Physics Forums | Science Articles, Homework Help, Discussion**