that we can find the net force acting on the trolley through free-body diagrams. To find the measured weight of the hanging mass, we use the following formula: W = mg where W is the weight of the hanging mass, m is the mass of the hanging mass, and g is gravity. To find the experimental net force acting on the trolley, we use: F net = mr ( 2 π T ) 2 where F net is the net force acting on the trolley, m is the mass of the trolley, T is the period of rotation. We assumed for this experiment that the string is massless, and had a negligible effect on the tension, and thus did not affect the net force acting on the trolley. Similarly, we also assumed the masking tape we used to help measure the radius (please see procedure section) did not have a mass and had a negligible effect on the results of our experiment. We assumed that the string never touched the inside of the spindle, and so there was no friction. Another assumption we made was that the pulley did not have a mass, and would not affect the net force. In addition, we assumed that there was no friction between the string and the pulley. Finally, we assumed that the track was perfectly leveled the whole time it was rotating. Even though the base of rotational apparatus was leveled, there was no way to adjust the base in such a way that the track would be completely horizontal throughout its entire rotation. An approximation we made is that the force of gravity is 9.81 m s 2 and that there is no uncertainty associated with it. Apparatus/Procedure: See page 81-83 of the Physics 1101/1120 lab manual, Richmond Campus Fall 2015 edition.
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