PHYS
Physics Lab write up 8

Windup the string until the mass holder is just below

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spool. Windup the string until the mass holder is just below the pulley. Press start and release the platen allowing the apparatus to run through three oscillations then click stop. Using the mouse to place the cursor on the graph of angular velocity, click and highlight the linear portion of the angular velocity graph. Under the fit option, select linear fit. The slope of the linear fit is the angular acceleration (αP). Record this value on the data sheet. Next the student will repeat this experiment for three different masses, 50gm, 70gms, 170 gms. Use a meter stick to measure radius(r) of platen, record the value on the data page. Use the electronic scale to find the mass (M) of the platen and record the data on the data page. Next, the students will find the formula for the moment of inertia of the disk using the necessary measurements of the disk, calculate the moment of inertia of the disk (I). Using the values of the angular velocity ( of the smart pulley, as determined from the graph of angular velocity. Calculate the angular acceleration (α) of the rotating platen, using the formula, α=(P/r). Record theses values in the data table. Calculate the applied torque ( using your value of the moment of inertia I and angular acceleration α. Next calculate the applied torque (from the equation m(g- Dα)D, as derived from the free body diagram. Then last the students will calculate the percent discrepancy between and . For our personal experiment we started out with a 31% discrepancy at .025kg of suspended mass between torque 1 and torque 2 and after all the other trials we ended with a percent discrepancy of 12.5% and a suspended mass of .175 kg. Thus proving that as mass increases the percent discrepancy between the two applied torques will decrease. Unfamiliar Terms :

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Torque: Torque, also called moment or moment of force, is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist. ( en.wikipedia.org/wiki/Torque ) Vernier caliper :
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