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MAPUA INSTITUTE OF TECHNOLOGY DEPARTMENT OF PHYSICS PHY10L/A5 E106-UNIFORM CIRCULAR MOTION Prof. Bernard Aguirre INTERPRETATION OF RESULTS This time, the experiment now deals with the more complicated application of Newton’s Second Law of motion the uniform circular motion. This type of motion is accompanied by a centripetal force which a force is causing a body to move circularly. The centripetal force, also known as the net force, is accelerating due to change in velocity but not in speed (Thus, only direction changes). The direction of acceleration is always towards the center of the circle. By making an ideal diagram of the system, we could perceive how each part of the apparatus in the lab works and how centripetal force is obtained. It is shown in Figure 6.1. As we can see, the tension(1), is oppositely directed to the weight. Thus, since it is the only force present in the y-component, T 1 =W. On the other hand, the horizontal component of the motion is accelerating towards the center. The spring is used to exert a force in pulling the mass on the center. We can measure this force by adding weights on the pulley. Remember that it is one property of spring that the force of tension pulling it, is also equal to the force it exerts in resisting it. The force exerted by the spring centripetal force, is also the tension pulling the spring. Thus, m 1 a=F c =F spring =T 2 . The tension(2) has a magnitude of m 2 g. It is the reason why we use F c as the weight of the pan+load times gravitational acceleration. It must be the actual force exerted by the spring or the centripetal force. It is instructed to let orange indicator be at a certain level on the apparatus due to spring must be exerting a consistent force for a uniform result on every trial. Another thing, the centripetal force
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This note was uploaded on 04/27/2011 for the course PHY 10L taught by Professor Agguire during the Spring '11 term at Mapúa Institute of Technology.

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