Physics Lab write up 7

Select start button in datastudio slowly increase the

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Select Start button in DataStudio. Slowly increase the voltage until the acceleration maintains a constant value. While the instrument is running steadily and continuously turn up the voltage to some predetermined value on the power supply. Note that the centripetal force is plotted on the computer display. Then stop the instrument by clicking on the Stop button and lowering the power supply voltage, stopping the motor. The instrument will then have plotted the measured centripetal force. Using the cursor tool the student will find the best estimate for centripetal force that was generated at a given/fixed velocity. The instrument for this experiment has both a data table and data display. The student will enter the data mass and force data into the table that they have drawn and then plot the data. The student will perform several different mass runs, each time varying the mass on the free and fixed mass holders, making sure to ramp up the motor to the same angular velocity each time. For the of part two the student will observe their Force vs. Mass Graph and select the “fit” button and then chose the appropriate fit for their data. The student must make sure the mathematical form of their fir and what the various coefficients represent. Next they will plot the graph and observe the line from the data they collected. Part three is Force vs. Radius (mass and velocity must be constant. In this part of the experiment, the student will keep the velocity and mass held at a constant as the radius is varied . Lowering the Force Sensor, or raising the rotating platform can increase the radius of the “free mass”. As the radius of the “free mass” increases, the “fixed mass” must be increased to a matching radius to balance the rotating arm. Again the force sensor measures the centripetal force. In this part the student will open the file: Force_rad SW and make sure the power supply is off when they begin. Then attach 30g masses to the string and the rotating platform. The “free mass” should be able to slide freely back and forth in the slot. If not adjust the nuts and washers accordingly. Next, adjust the height of the force sensor so that the sliding mass radius matches the fixed mass radius. The student will change the radius by 10 cm (.010 m) each time and adjusting the voltage from 0 to 5V. Observe the vertical section of the cable. If the vertical section of the cable is not completely vertical, adjust the horizontal rod and turn the power supply down to 0V. Pull the mass to tighten the cable to make sure the radius is balanced. Enter the force into the Force vs. Radius data table. When ready the student will press the Start button. They will slowly increase the voltage until the acceleration achieves and maintains a constant value. Then press the Stop button. Without changing the voltage, turn off the power supply. Next press the “ZERO” button on the Force Sensor. Turn on the power supply then press the Start button. The student will observe the velocity
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