# Homework Help: F.B.D. for beam on disabled hoist (confirmation on work needed)

1. Aug 18, 2010

### LauraR

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

Hi guys,

I'm doing an assignment for college and designing a disabled hoist. I want to complete FBDs on the top beam especially. Can anyone help answer whether the work i've done is correct?

2. Relevant equations

the equations I used were the sum of all force = 0

and for the bending stress that the shear force = dm/dx

3. The attempt at a solution

Please see the two pictures attached for my attempts at (very quickly) drawing what i believe to be the correct solution. I'm taking the hwole thing to be static, as in the linear actuator is creating a force opposing the Load F. I would really appreciate some feedback, because I find F.B.D's hard to grasp, and I could be totally wrong!

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

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

#### Attached Files:

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• ###### sheer and bending D.JPG
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2. Aug 19, 2010

### LauraR

Can anyone shed any light on this?

3. Aug 19, 2010

### vela

Staff Emeritus
What about the weight of the beam?

4. Aug 19, 2010

### LauraR

How would I incorporate w into a shear diagram? Would it effect it? I understand w is another force acting on the beam and will put it in the top FBD, but I don't know what to do for the Shear and bending diagrams.

Thanks

5. Aug 19, 2010

### vela

Staff Emeritus
It's just another force. Treat it like you did the other forces.