3.2.4 Experiment procedures
1)The usage of general computer millisecond meter
(1)Connect the photoelectric gate with a millisecond meter,where only one photoelectric gate is used.
(2)Switch on the power supply and the instrument begins to conduct self-test.
(3)Select the function“Time 1-2 multi-pulse”.
(4)Select correct the communication channel and begin the experimental measurement.
2)Measure the moment of inertia of a body
(1)Assemble the moment of inertia equipment as shown in Figure 3.2.1,and connect the“General Computer millisecond meter”.
(2)Level the metal platform and adjust the horizontal pulley so that the cord will pull in the horizontal direction as it unwinds from the axle.(https://www.daowen.com)
(3)Measure and record the data for the empty metal disk.
(4)Place one of the regularly shaped objects on the metal disk so that its center of mass is on the axis of rotation.Measure and record the data with and without the weights.
(5)Use Equation(3.2.9)to compute the angular acceleration with and without the weights.
(6)Use Equation(3.2.4)to calculate the moment of inertia of the metal disk with and without the added body.
(7)According to Equation(3.2.5),the moment of inertia of the test body placed on the disk can be determined.
(8)Compared the theory value and the experimental value and calculate the relative error.
3)Verify the parallel axis law
Place two solid cylinder symmetrically on the cross objective table with a certain central distance d,and measure the total moment of inertia J.If J is equal to J0+2md2,the parallel axis theorem can be verified.
