Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter

    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...
    Attached Images

    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

    anticlockwise moment
    Distance from pivot to centre of mass = 2m
    weight = 1000N

    moment = 2 x 1000 Nm

    clockwise moment
    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

Submit reply
Turn on thread page Beta
Updated: January 25, 2017
“Yanny” or “Laurel”

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.