Hey there! Sign in to join this conversationNew here? Join for free

M3 Edexcel Statics of Rigid Bodies, Force acted on an object (sliding/toppling) Watch

    • Thread Starter
    Offline

    3
    ReputationRep:
    https://gyazo.com/cd8ecfbc5966239cda66f850e440e422
    https://gyazo.com/1c1c1a70f77139d0c4ff04b70f75a0a1
    Above are the questions and the solutions from its solution bank.
    In the solutions, when working out Qa, the direction of friction is taken as downwards, and the question is solved by taking moment about point A. However what I don't understand is why when working out Qb, the direction of friction is taken as parallel to the plane, instead of going downwards to the plane like in Qa? Thanks in advance.
    Offline

    18
    ReputationRep:
    Huh? i don't see the part where they say friction acts downwards
    • Study Helper
    Offline

    13
    (Original post by Nerrad)
    However what I don't understand is why when working out Qb, the direction of friction is taken as parallel to the plane, instead of going downwards to the plane like in Qa? Thanks in advance.
    Although the image at the top of your second attachment appears to show a force "F" acting downwards, in fact the F refers to the arrow going left from A The downward arrow relates to the Mg.

    Rather a poor diagram.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by ghostwalker)
    Although the image at the top of your second attachment appears to show a force "F" acting downwards, in fact the F refers to the arrow going left from A The downward arrow relates to the Mg.

    Rather a poor diagram.
    Oh it's you again . I love you man, thanks.
    • Study Helper
    Offline

    13
    (Original post by Nerrad)
    Oh it's you again . I love you man, thanks.
    :blush:
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Are unpaid trial work shifts fair?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.