Centripetal Acceleration Lab

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Submitted By toly95
Words 305
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Centripetal Acceleration Lab
Purpose: To understand and verify the relationship of Centripetal Force, where m is mass, v is velocity and r is radius.
Part 1: Set up apparatus, which consists of a rotor mechanism containing a mass m attached to a spring. Tape on a piece of cardboard vertically onto one end of the rotor to trigger the photogate timer. Start the rotor and gradually increase speed until the metal pointer just flips up. Record the time (up). And then gradually decrease until the metal pointer just flips down. Record the time (down). Calculate the force on the rotating mass m.
Part 2: Rotate rotor from Part 1 so that mass m hangs straight down. Attach a short loop of fishing line at the bottom of the mass. Add weight (mass) onto loop and keep adding weight until the metal pointer just flips up. Record the mass (up). Then little by little, remove the weights until the metal pointer just flips down. Record the mass (down). Calculate Force=mg.

The data and sample calculations are attached below. The typical relative uncertainty for Fc was 16%, while the typical relative uncertainty for Fg was 2%. Thus Fg is a more precise measurement than Fc. Both parts gave the similar Newton answers (about 21-22N). Some error in this lab may have been caused by air resistance/friction, slowing down mass and increasing period. Another error can be caused by time measurement/calibration, which can be reduced by timing a number of rev and finding the average. Another error can be made due to sloppiness in measurements and calculations. For example, in part 2, it was hard to keep the string of weights stable, which caused it to move around therefore causing uncertainty in the force needed to flip the needle…...

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