Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    I've missed two Mechanics lesson in a row, and have to catch up. Completely confused as what to do. I've done other some other questions fine, but never with just m. I'm guessing it's quite easy, but I'm missing something.

    A particle of mass mkg slides down a smooth plae, inclined at an angle of 30 degrees to the horizontal. Find the acceleration of the particle to the plane.

    Please quote me and I will return rep.
    Offline

    2
    ReputationRep:
    Generally, for these types of questions, you have to draw a diagram like this:

    And resolve.

    Can you work the acceleration component out from there?
    Offline

    20
    Heeey SuperKurd!

    Basically the method I know is:
    - Draw a diagram, and draw on all the forces (including weight), and their components (parallel/perpendicular) to the slope
    - Do F = ma along the slope, and you will find the acceleration.
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hmm.. I don't think so. R= mgcos30 I think and the coefficient is 0.8 do am I right in thinking Friction = 0.8 mgcos30.And because it's going down the slope it's (mg sin 30) - (O.8mgcos30)= ma

    That's where I'm like what to do

    (Original post by + polarity -)
    Heeey SuperKurd!

    Basically the method I know is:
    - Draw a diagram, and draw on all the forces (including weight), and their components (parallel/perpendicular) to the slope
    - Do F = ma along the slope, and you will find the acceleration.
    Saw this after I posted. Erm, but whats M? I don't have M guys btw.
    Offline

    0
    ReputationRep:
    (Original post by SuperKurd)
    I've missed two Mechanics lesson in a row, and have to catch up. Completely confused as what to do. I've done other some other questions fine, but never with just m. I'm guessing it's quite easy, but I'm missing something.

    A particle of mass mkg slides down a smooth plae, inclined at an angle of 30 degrees to the horizontal. Find the acceleration of the particle to the plane.

    Please quote me and I will return rep.
    I'd use F=ma, parallel to the slope, assuming you know the mass of the particle. The force 'F' will include the reaction force and the weight. You need to find their component parallel to the plane eg it will involve sin30 or whatever. Then you should be able to find 'a'. Have a go and get back to me -I don't want to give away too much at this stage! See what you can do
    Offline

    0
    ReputationRep:
    (Original post by SuperKurd)
    Hmm.. I don't think so. R= mgcos30 I think and the coefficient is 0.8 do am I right in thinking Friction = 0.8 mgcos30.And because it's going down the slope it's (mg sin 30) - (O.8mgcos30)= ma

    That's where I'm like what to do
    just cancel the m's and you can find a!
    Offline

    0
    ReputationRep:
    There's an m in every term yeah? So you can divide through by m
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by hannah1992)
    just cancel the m's and you can find a!
    I need some sleep. How I missed an easy step like that

    I'll rep you all for putting up with my retardation.

    Oh turns out I can't do that. LOL my apologies.
    Offline

    0
    ReputationRep:
    Don't worry about it - we all have those moments!
    Thanks
 
 
 
  • 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
    Brexit voters: Do you stand by your vote?
    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

    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.