Join TSR now and get all your revision questions answeredSign up now

M1 finding the tension, in a string using moments? Watch

    • Thread Starter
    Offline

    0
    ReputationRep:
    http://www.youtube.com/watch?v=m5uh8...feature=relmfu if you skip to 1:40,

    My question is why does the fact that the tension passes through A mean that it does not have any affect? Is it something to do with the parallel rule for moments, also could someone explain that to me as well please.

    Here it is the parallel rule(i don't know the actual name for it so im just calling that)
    The moment of a parallel component force is 0.
    Offline

    0
    ReputationRep:
    (Original post by Core)
    http://www.youtube.com/watch?v=m5uh8...feature=relmfu if you skip to 1:40,

    My question is why does the fact that the tension passes through A mean that it does not have any affect? Is it something to do with the parallel rule for moments, also could someone explain that to me as well please.

    Here it is the parallel rule(i don't know the actual name for it so im just calling that)
    The moment of a parallel component force is 0.
    A moment about a point, A, is equal to a force multiplied by the distance between the point A and the line of action of the force (in sense perpendicular to that force).

    If this distance is 0, i.e. the force acts through the point, then the force multiplied by the distance is zero, and the moment is zero.
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Ziltoid)
    A moment about a point, A, is equal to a force multiplied by the distance between the point A and the line of action of the force (in sense perpendicular to that force).

    If this distance is 0, i.e. the force acts through the point, then the force multiplied by the distance is zero, and the moment is zero.
    So as there us no perpendicular distance there is no moment ,is that correct?
    Offline

    0
    ReputationRep:
    (Original post by Core)
    So as there us no perpendicular distance there is no moment ,is that correct?
    Precisely.
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Ziltoid)
    Precisely.
    Much appreciated thank you.
 
 
 
Poll
Is GoT overrated?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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

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