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Cantilever bicycle brake question

  1. Apr 10, 2014 #1
    1. The problem statement, all variables and given/known data

    A force F of 90N is applied to the cable and each calliper rotates about its hinge at B. With what force does each brake block at A push against the wheel rim?

    * Image attached *

    2. Relevant equations

    Moment_B = ( Distance from B ) x ( Force acting on calliper perpendicular to mentioned distance )

    3. The attempt at a solution

    Force on each string = 90 / 2 = 45N

    Length of calliper at 45° to hinge B = (50 - 40cos45°) x 10^-3

    1_Moment_B = 50 x 10^-3 x 45

    2_Moment_B = ( 50 - 40cos45° ) x 10^-3 x F_brakeBlock@A

    1_Moment_B = 2_Moment_B

    F_brakeBlock@A = 79.549N
     
  2. jcsd
  3. Apr 10, 2014 #2
  4. Apr 10, 2014 #3

    berkeman

    User Avatar

    Staff: Mentor

    I get an Error 404 when trying to view the attachment.
     
  5. Apr 11, 2014 #4
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