PHYS
Physics Lab write up 8

# A linear measuring instrument consisting of a scaled

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A linear measuring instrument consisting of a scaled rule with a projecting arm at one end, to which is attached a sliding vernier with a projecting arm that forms a jaw with the other projecting arm ( ) Power : the rate at which the force does work. (from lab manual) Linear Dynamics : objects moving in a straight line. (from lab manual) Rotational dynamics : Objects moving in a circular path. (from lab manual) Tangential component : the component that causes the wheel to spin (from lab manual) Linear acceleration : The rate of change of velocity without a change in direction. ( - online.org/dictionary/Linear_acceleration ) Angular acceleration: the rate of change of the angular velocity of a rotating body( wordnetweb.princeton.edu/perl/webwn ) Data: (look at attached excel sheet) Analysis: (look at attached excel sheet) Results and Conclusion: This lab was executed to help the students know and understand how to measure the angular motion of a disk, which rotates due to the application of a force. For our 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. Possible discrepancies in our data could be: not being able to read the caliper, wrong calculations, rushing to stop the computer taking data and not letting the apparatus complete three full oscillations, and not using the meter stick right for the radius of the platen. Questions: 1. What effect did the increased mass have in the angular acceleration? Answer: Even a small change in the mass was able to increase the angular acceleration greatly. 2. What effect did it have on the percent discrepancy between the two torque calculations, why? Answer : As the mass was increased, the percent discrepancy between the two torque calculations decreased.
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