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# lab11 - 4 Place the meter in the torque balance at a chosen...

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Brad Tensen April 11, 2007 Physics 211L – Sec 54 Lab 11 Equilibrium of Torques Introduction: If an extended object is to be in static equilibrium, the vector sum of all external forces acting on the object must be zero and the vector sum of all torques produced by external forces about any arbitrary rotation must be zero. The weight of the object acts along a vertically downward direction along a line passing through the object’s center of mass, and therefore will be in general produce a torque about a rotation axis, unless the axis passes through the center of mass or is vertical. Torque is defined as r = r x F Procedure: 1. Find the center of mass (rc) of the meter stick. 2. Find the actual mass of the meter stick with a balance (M). 3. Write these numbers in the appropriate spaces in the data sheet.
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Unformatted text preview: 4. Place the meter in the torque balance at a chosen location r1 5. Place a mass (m) at a location on the stick that balances the meter stick. 6. Write down these numbers on the chart. 7. Calculate M by using the equation M=m(r1-r2)/(rc-r1) 8. Repeat this procedure for five more masses and locations. 9. Then average the M’s and find the standard deviation. Conclusion After completing the experiment and finding the averages, our group calculated an average of 0.083 kg. This is pretty close to the actual mass of the meter stick which is 0.086 kg. We also found that numbers were more accurate when smaller values of m were used. Also if larger values for r1-r2 and rc-r1 were used our values were more accurate....
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