# Free body diagram of a beam construction

## Homework Statement

Beams AC and BD are light (no mass) and they're conjoined at B. Points A and D are fixed but frictionless. The radius of the wheel is R and the weight hanging on the pulley has the mass m.

Fx=0
Fy=0
M=0

## The Attempt at a Solution

I'm stuck at the very beginning of the problem which is to draw a free body diagram (the body is in equilibrium) of the construction however my equations dont add upp. The obstacle I'm currently facing is knowing which way the all the different forces are facing.

#### Attachments

• Screenshot 2015-03-12 at 10.54.41 AM.png
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## Answers and Replies

SteamKing
Staff Emeritus
Science Advisor
Homework Helper
You know that the hanging mass m is affected by gravity. Start there and work back into the structure.

If you need more detailed help, you should post your FBD and the equations you're having trouble with.

P.S.: I'm moving this thread to the Engineering HW forum, which is a more relevant forum than Advanced Physics.

billy_joule
Science Advisor
Make free body diagrams of each piece. You know the sum of moments about any point is zero and that all forces add to zero. The trick is to choose convenient points to take moments about.

Solved it! Thank you both for the reply.