- #1
How Do I Calculate F1 and F2 in This Equilibrium Problem?
- Thread starter Naldo6
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- Equilibrium Forces
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Homework Help Overview
The discussion revolves around calculating forces F1 and F2 in an equilibrium problem, with participants exploring the application of moments and force components in their reasoning.
Discussion Character
- Exploratory, Conceptual clarification, Mathematical reasoning
Approaches and Questions Raised
- Participants discuss using moments and components to analyze the forces involved. Questions arise about the correct setup of equations and the interpretation of moments in the context of equilibrium.
Discussion Status
Some participants have offered guidance on using moments to approach the problem, while others have shared their attempts at formulating equations. There is acknowledgment of a correction regarding the inclusion of mass in the calculations, indicating a productive direction in the discussion.
Contextual Notes
Participants mention specific variables (D1, D2, D3, D4, F3, F4, F5) and the need for numerical values to proceed with calculations. There is an emphasis on ensuring all components, including mass, are accounted for in the equations.
- #2
tiny-tim
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Naldo6 said:
Hi Naldo6!
In problems like this, you can take components in a direction, or you can take moments about a point.
Try moments!
- #3
Naldo6
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how i try that?...
- #4
tiny-tim
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moments of forces
Moments are like a see-saw … the smaller you are, the further away you have to be to balance someone bigger.
In equilibrium, the moments all add up to zero (just like ordinary components of force).
The moment of a force about a point is the force times the distance from that point.
Just choose a point, and calculate all the moments.
Naldo6 said:
Moments are like a see-saw … the smaller you are, the further away you have to be to balance someone bigger.
In equilibrium, the moments all add up to zero (just like ordinary components of force).
The moment of a force about a point is the force times the distance from that point.
Just choose a point, and calculate all the moments.
- #5
Naldo6
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is this correct for F2:
0=-F3D1 - (D1+D2)F4 - (D1+D2+D3)F5 + (D1+D2+D3+D4)F2 - ((D1+D2+D3+D4)/2)(9.8)
then F2= [ F3D1 + (D1+D2)F4 + (D1+D2+D3)F5 + ((D1+D2+D3+D4)/2)(9.8) ] / (D1+D2+D3+D4)
right?...
and then F2 + F3 + F4 + (9.8)(mass) = F1 + F2 to calculate the other righ?...
i do that but i don't get my answers...
- #6
tiny-tim
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Naldo6 said:
Hi Naldo6!
Did you mean to type
F2= [ F3D1 + (D1+D2)F4 + (D1+D2+D3)F5 + ((D1+D2+D3+D4)/2)(9.8)(mass) ] / (D1+D2+D3+D4)?
(which you could simplify to F2= (9.8)(mass)/2 + [ F3D1 + (D1+D2)F4 + (D1+D2+D3)F5] / (D1+D2+D3+D4))
If so, that should be right.
Do D1 etc have numbers?
If so, show us the full calculation, and maybe we can see the mistake.
- #7
Naldo6
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ty... i get the correct answer with my formula, i just wa smissing my mass in the F of gravity ... ty a lot
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