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Homework Help: Torque and Equilibrium Lab

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Purpose: Determine the mass of a meter stick without directly measuring it.

    Possible Materials:
    Select the appropriate materials you will use.

    __ Meter Stick __ Thermometer __ Stop watch __ Washers __ Knife edge
    __ Plastic ruler __ Known Masses __ String __ Pencil __ Metal/wooden rod
    __ Marbles __ Cardboard pieces __ Sponge pad __ Sticky tape __ Elastics

    You are not allowed to use a scale!

    2. Relevant equations

    How do i work this out?...im stuck

    3. The attempt at a solution

    I think from the conditions of mechanical equilibrium, Net Force = 0 and Net torque = 0 you could solve it... But im not sure how.....
    Last edited: Nov 12, 2009
  2. jcsd
  3. Nov 12, 2009 #2
    I would try to use the string the Washers and the pencil to somehow create a truck. I would put the meter stick on it and somehow give it a certain force ( like tie it with the metal rod) and count the time it needs to go some distance. Then I would repeat that replacing though the Meter stick with the known masses.
  4. Nov 15, 2009 #3
    what? we ar supposed to use torque and equilibrium not kinematics
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