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This is the sort of problem that you will see...someday.

The solid cylinder shown in the figure is of mass 5kgs and radius 25cm. It is kept on two rail-like planks and a force 15N is applied as shown..

What is the force of friction on the cylinder from one plank??

14 comments:

  1. Sambhav GuptaMay 23, 2010 at 2:51 AM

    This comment has been removed by a blog administrator.

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  2. AnujMay 23, 2010 at 3:15 AM

    bingo! here's one for the records...
    never has someone given a correct answer to my "answer in 1st attempt" question in the 1st post of the problem!!

    ReplyDelete
  3. akash rupelaMay 23, 2010 at 4:20 PM

    is it 15 by chance?

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  4. UnknownMay 23, 2010 at 5:50 PM

    5 from each plank?

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  5. somay jainMay 23, 2010 at 6:11 PM

    yes same as vaibhav..
    5 from each?

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  6. guntashMay 23, 2010 at 6:52 PM

    5 on each plank

    ReplyDelete
  7. AmitMay 23, 2010 at 7:06 PM

    yes getting 5 only

    ReplyDelete
  8. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○May 23, 2010 at 7:36 PM

    yes,5 on each plank

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  9. akash rupelaMay 23, 2010 at 9:25 PM

    yeah, 5 only, i did 4+2=2 :D

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  10. ankush sachdevaMay 24, 2010 at 8:47 AM

    yes..5 but only if the planks are equidistant from centre of cylinder

    am i rite??

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  11. ♥◘○µ╦┬░Γ╪╬└↑φΦ╫╛◙«½╣↔⌐☺♠♦♣◘○May 24, 2010 at 9:18 AM

    yes,they must be equidistant from the center of the cylinder.This must be mentioned by Anuj bhaiya.

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  12. AnujMay 24, 2010 at 2:50 PM

    yes, i guess the planks should be equidistant:

    suppose they are not, also assume planks are very thin.

    distance of the vertical thread from the two planks are:
    from plank nearer to you: 3m.
    from the other: 5m.

    now find the forces of friction, assuming pure rolling.

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  13. Sambhav GuptaMay 24, 2010 at 3:21 PM

    3.75N and 6.25N

    ReplyDelete
  14. Pratik JainSeptember 25, 2010 at 1:37 PM

    not able to get the answer for unsymmetrical case....pls help...

    ReplyDelete

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