Turn on thread page Beta
    • Thread Starter
    Offline

    3
    ReputationRep:
    Could anyone help me with a couple of M1 questions?

    Firstly, Part iii A) and B)

    Name:  ImageUploadedByStudent Room1431359818.569866.jpg
Views: 77
Size:  129.8 KB

    I've got them right, but I've just assumed friction changes direction from what it was in part i/ii. How do I know that friction changes direction (in both parts) without knowing the value of T??

    Then this one:
    Name:  ImageUploadedByStudent Room1431359957.843008.jpg
Views: 68
Size:  144.8 KB


    4 part i. The mark scheme is not helpful at all here.


    Thanks in advance!


    Posted from TSR Mobile
    • Study Helper
    Offline

    15
    Study Helper
    (Original post by indigorain)
    I've got them right, but I've just assumed friction changes direction from what it was in part i/ii. How do I know that friction changes direction (in both parts) without knowing the value of T??
    Because the 3N force is still being applied and without T it's in limiting equilibrium. If T is now applied and it's again in limiting equilibrium, it must be on the verge of moving in the opposite direction, and friction is thus in the opposite direction to what it was before.


    4 part i. The mark scheme is not helpful at all here.
    You need to show that for all values of 'e', the velocity of Q is greater than zero, i.e. it has changed direction.
    Offline

    12
    ReputationRep:
    Alright lets upload part 2, ill do part 1 in a moment. Btw this was my M1 exam

    EDIT: Part 1 was answered by ghost walker.
    Offline

    12
    ReputationRep:
    (Original post by indigorain)
    Then this one:
    Name:  ImageUploadedByStudent Room1431359957.843008.jpg
Views: 68
Size:  144.8 KB


    4 part i. The mark scheme is not helpful at all here.


    Thanks in advance!


    Posted from TSR Mobile
    Name:  ImageUploadedByStudent Room1431362706.188304.jpg
Views: 60
Size:  132.1 KB

    I am 100% sure this is right as I got 72/72 on this paper.

    Posted from TSR Mobile


    Offline

    12
    ReputationRep:
    (Original post by ghostwalker)
    You need to show that for all values of 'e', the velocity of Q is greater than zero, i.e. it has changed direction.
    This is M1, all collisions are perfectly elastic. They have not learnt about coefficient of restitution, that is M2
    • Thread Starter
    Offline

    3
    ReputationRep:
    Thank you very much, everyone!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: May 11, 2015

2,953

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process
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

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