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# Moments M2 Maths watch

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1. -Crane is lifting a uniform beam (crane attached just to the right of the centre of the beam)
-Mass of 800 N at one end of the beam
-weight of beam =4200N
-length of beam =12m

Find the distance between the mass and the cranes vertical chain.
2. (Original post by Dexter212)
-Crane is lifting a uniform beam (crane attached just to the right of the beam)
-Mass of 800 N at one end of the beam
-weight of beam =4200N
-length of beam =12m

Find the distance between the mass and the cranes vertical chain.
I don't quite get what you mean. Is the mass at the left hand end of the beam, with the crane attached at the right? What do you mean "just to the right of the beam" - it must be attached to the beam somewhere! Do you mean just to the right of the centre of the beam? Is there a picture you can show us?
3. (Original post by Pangol)
I don't quite get what you mean. Is the mass at the left hand end of the beam, with the crane attached at the right? What do you mean "just to the right of the beam" - it must be attached to the beam somewhere! Do you mean just to the right of the centre of the beam? Is there a picture you can show us?
yh i meant the crane was attached just to the right of the centre of the beam sorry,
the mass is at the very end of the right hand side.
4. I suspect it's this:

5. (Original post by Dexter212)
yh i meant the crane was attached just to the right of the centre of the beam sorry,
the mass is at the very end of the right hand side.
Ah - clearer!

You need to give a name to the unknown distance. It doesn't matter where you use as a reference point, but it's probably easiest to do it from the right hand side, since you want to know the distance from the mass to the crane. Now take moments about a carefully chosen point, and use the principal of moments.
6. (Original post by ghostwalker)
I suspect it's this:

Thats the picture wow
7. (Original post by Pangol)
Ah - clearer!

You need to give a name to the unknown distance. It doesn't matter where you use as a reference point, but it's probably easiest to do it from the right hand side, since you want to know the distance from the mass to the crane. Now take moments about a carefully chosen point, and use the principal of moments.
i still cant find the distance
8. (Original post by Dexter212)
i still cant find the distance
Call the distance from where the chain is attached to the beam to the right hand end d.Try taking moments about the point where the chain is attached to the beam. The only tricky part should be finding the distance from this point to the centre of mass of the beam in terms of d. Then use the principal of moments. You should only have two moments to consider, so it won't be a massive equation.
9. (Original post by Pangol)
Call the distance from where the chain is attached to the beam to the right hand end d.Try taking moments about the point where the chain is attached to the beam. The only tricky part should be finding the distance from this point to the centre of mass of the beam in terms of d. Then use the principal of moments. You should only have two moments to consider, so it won't be a massive equation.
Thank you, ive done it.

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