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In experimental study, to reduce the experimental error, has made many experiment improvements, in here in view of the simple harmonic motion, the rotor inertia, the simple pendulum and the duplicate pendulum, refractive index survey's several experiments wrote the paper. In simple harmonic motion experiment, spring when extracts the tension constant using the Hooke's law, the attention must take the stress and the elongation quantity for the linear relationship, and does not surpass the elastic definition; Will vibrate the object quality close spring quality, can see obviously in the analysis the spring quality integrates the consideration, can more precise extract the tension constant. In the rotor inertia experiment, we request the initial velocity are 0, in the primary improvement may reduce the error to 5%, but the initial velocity beyond control is 0; Therefore in the new edition correction, rewrites the principle may eliminate the initial velocity, but uses the acceleration principle to do the experiment, may reduce the error to 1%, may also reduce the run time, is the very big corrective method. In the simple pendulum experiment, must the swinging spot reduction friction force, swinging probably in the identical plane, when minute angle swinging, may increase the survey cycle number of times to ask the average; When wide angle swinging, use photoelectric timer survey sole cycle. In the duplicate pendulum experiment, is small using the cutting edge and the stainless steel frame contacted area, causes the friction force influence to be very small, can make the multiple cyclical survey to ask the average, reduces the error. At the refractive index survey experiment, needs to make the laser light from the very beginning to adjust, will determine that the wave length the green light laser extracts other colored lights using the diffraction grating the wave length, then tests with Snell's Law is observable the refractive index, but is very small because of the assorted light's refracted light difference, needs the very precise survey, therefore forms the principle using the rainbow to be possible the clear resolution assorted light refractive index.
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