1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Lever system - brake (counting of forces)

  1. Nov 6, 2012 #1
    I tried to solve this question:
    So F1D1=F2D2. Thus:
    60N/ 0,06m x 0,2 m= f/0,02m x 0,04m
    =100 Newton applied to the piston, but this doesn't fit to the answers offered.
    What did I wrong?:(
  2. jcsd
  3. Nov 6, 2012 #2
    Why are you dividing the 60 N force by 6 cm?
  4. Nov 6, 2012 #3
    Because it applies some force on the area, isnt it?

    It's so easy, that I just need to divide 60N by 0,2M?
  5. Nov 6, 2012 #4
    I think you are mixing the lever rule with the hydraulic press (Pascal principle).
    The question is about forces. You don't need pressures. And dividing by 6 cm will not give pressure anyway (it's piston's diameter not its area).
    Are there more questions related to the same diagram?
  6. Nov 6, 2012 #5
    No, only this one.
    Have you managed to solve it?
  7. Nov 6, 2012 #6
    Use the equation for the lever or just equilibrium of torques around the pivot.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook