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!

Torque w/ 2 Supports

  1. Oct 19, 2014 #1
    1. A 6.0 m long uniform plank is balanced on two supports with are 3.7 m apart. The plank weighs 400N. If one of the supports is 0.5m fro one end of the plank, how far from the other end can a 65 kg load hang without the plank tipping over?

    and

    A 7.2 m long beam AB weighing 480 N has its center of gravity 2.4 m from A. A 5.0 kg mass and a 2.5 kg mass are hung from the beam at 1.2 m and 0.8 m distances from B respectively. Calculate the position where the fulcrum is placed to keep the beam in equilibrium horizontally.


    2. If someone could give me tips on a method of generally approaching such problems, I would appreciate it


    According to the laws of equilibrium, the moments of the force on with either side of the fulcrum must be equal, and the force acting downward must be equal to the opposite force acting upward.

    Keeping that in mind I calculated the weight of 65 kg load mg - (65)(9.8) =637. I have had this problem for a while and have tried so many different methods i cant remember them all. Calculating the weights and trying to make them equal. Calculating the moments. Adding subtraction dividing etc. my instructor refuses to help.

    I am stuck, I have no idea how to attack it now simple. Please help!!!! I have four other similar problems.
     
  2. jcsd
  3. Oct 19, 2014 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Please post at least one attempted solution, showing all working. Keep it all symbolic, not plugging in any numbers yet.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted