Experiment 7 Lab report

Experiment 7 Lab report - 0 Experiment 7 Centripetal Force...

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1 Experiment 7: Centripetal Force PHYS 124-011 Instructor: Sijie Lin Steven Yi 10/13/06

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2 Abstract The purpose of this laboratory experiment is to better understand centripetal force and acceleration, and see Newton’s Second Law in action. This will be achieved by the usage of a rotating platform and weighted bob attached to three strings. One string will be attached to a side post assembly, the second will be attached to a center post with a spring, and finally the last string will have varying weights attached ranging from 25 g to 105 g to see its affects on rotational motion. From graphing the data in a certain fashion we should be able to identify the experimental values of F c , centripetal mass, and radius. We will be using various equations to find our spring force, tension, centripetal force, velocity, centripetal force and acceleration. All these equations can be found the lab manual on pages 7-1 through 7-3.
3 Data: Exercise 1: Data Table 1 Centripetal mass, m 1 : Hanging Mass, m 2 : Rotational Radius (m) Period, T (s) T 2 (s 2 ) 0.193 1.456 2.120 0.200 1.504 2.572 0.207 1.578 2.262 0.214 1.597 2.490 0.221 1.606 2.580 0.228 1.756 3.084 0.235 1.781 3.172 Slope 0.308 Accepted centripetal force, F c = m 2 g 0.540 Experimental Value of F c 0.308 % Difference 38.3 % Graph Data: T 2 m1*4((PI)^2)*r (s 2 ) 2.13 1.59 2.28 1.65 2.5 1.71 2.56 1.76 2.59 1.82 3.1 1.88 3.17 1.94 For the x-coordinates we used the T 2 values versus equation 7.9 in the Lab manual in order to determine the centripetal force. This graph can be found on page 4.

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