How would I answer this momenys question , I am aware the clockwise moment needs to be equal to the anti moment but why do they do 1000 x 2 as part of the answer , I know the formula is distance x force , I would just like some clarification of to why they have done what they have done and then divide by 5 etc...
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Moments question watch
- Thread Starter
- 25-01-2017 22:25
- 25-01-2017 22:35
Look at the direction of the arrow for weight - you can see that this will turn the anticlockwise, therefore it is an anticlockwise moment, which you can calculate.
Similarly, look at the arrow for the tension - in what direction will this moment act?
You correctly stated the principle of moments, and all the question has done is plug their values into the "sum of anticlockwise moments = sum of clockwise moments" and rearranged for T
- 25-01-2017 22:36
Distance from pivot to centre of mass = 2m
weight = 1000N
moment = 2 x 1000 Nm
distance from pivot to rope attachment = 2+3m
tension = T
moment = 5 x T Nm
because the system is in equilibrium the size of the anticlockwise moment is equal to the size of the clockwise moment...
2000 = 5 x T
divide both sides of the equal sign by 5