# MOMENTS- GENERAL RULES FOR WHEN TO RESOLVE ^ AND >Watch

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Thread starter 14 years ago
#1
Hi, i had a question which involved a suspended beam, two supports. One had tension T the other 3T. beam had two weights on it: 150g and 250g.

Does this mean at each of the supports there was 100gN and 300gN since the weights must equal the tension?

Im a little unsure when to resolve horizontally and when vertically.........can anyone help?
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14 years ago
#2
(Original post by faa)
Hi, i had a question which involved a suspended beam, two supports. One had tension T the other 3T. beam had two weights on it: 150g and 250g.

Does this mean at each of the supports there was 100gN and 300gN since the weights must equal the tension?

Im a little unsure when to resolve horizontally and when vertically.........can anyone help?
Generally you always resolve horizontally and vertically. In more complicated equilibrium questions you will also take moments.
If those are the only forces acting, and they are all acting in the same direction, then you would say T+3T = 150g + 250g = 4T = 400g, hence T = 100g and the tensions are 300g and 100g respectively.
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Thread starter 14 years ago
#3
hi Gaz, sorry i mean specific to moment related question- im a little unsure when to take moments, resolve ^ and >
0
14 years ago
#4
(Original post by faa)
hi Gaz, sorry i mean specific to moment related question- im a little unsure when to take moments, resolve ^ and >
Always resolve vertically, horizontally and take moments in such questions.
Usually the equation you get from taking moments will form the main body of your answer and you will substitute information found from your resolving into the moment equation to simplify it into the requred variables.
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