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Homework Help: Beginner Needing Help with Vector Physics Lab

  1. Sep 9, 2008 #1
    Hi! Can someone give me a general idea of how I do this?
    In my lab today we a pulley system with two spring balances attached to a long sting. We had to do several configurations and measure the angle and record the reading on the spring balances. Could someone guide me as to how to do the calculations for this?
    For example:
    A 150 g weight was attached to the string
    Spring balance reading string 1 (the magnitude I guess): 120g
    Angle string 1: 65 degrees
    Spring balance reading string 2: 20g
    Angle string 160 degrees

    I'm supposed to see if all the forces add up to zero. I'm not quite sure if my lab group did the lab right, but could someone please help me figure out the calculation setup for this. Thank you so much!
  2. jcsd
  3. Sep 9, 2008 #2
    Are the angles measured with respect to the vertical or horizontal, or what?
  4. Sep 9, 2008 #3
    From the horizontal
  5. Sep 9, 2008 #4
    Please help!
  6. Sep 9, 2008 #5
    Do you add the magnitude of the sum of the vectors formed by the string and then the mass of the weight * acceleration?
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