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lab_16

# lab_16 - LAB 16 Circular Motion Introduction Our objective...

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Circular Motion Introduction : Our objective in this experiment is to study Newton’s second law as it applies to an object in uniform circular motion. In this experiment we will analyze the motion of our mass as it moves i n c ircular m otion of f ixed r adius, but e xperiences di fferent c entripetal ( center s eeking) forces. Figure 1: Equipment for the Circular Motion Experiment showing the circular apparatus, the hanging masses used to measure the centripetal force of the spring, the photocell (photogate) and black rod used to measure the period of the mass M's motion; the shafts used to vary Equipment: Circular motion apparatus (shown in Figure 1), LabPro interface, Lab#16 Circular Motion software program , Excel software program , photogate, Scale and slotted weights, meter stick, length of s tring. Theory: In order for an object to move in a circular path, or even part of a circular path (such as when an object changes direction), Newton’s first law tells us there must be a net force acting on the object LAB# 16

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and that force must have a non-zero component towards the center of the circular path in which the object is moving. That is, a change in direction of the velocity of the object implies an acceleration and he nce a f orce. In t his e xperiment w e a re i nterested i n a n obj ect m oving i n uni form c ircular motion. That is, an object moving in a circular path at constant speed. This tells us that the net force on the object is strictly towards the center of the circle (centripetal force) and according to Newton’s second law is given by, C C Ma F = (1) where Fc is the net centripetal force acting on the object of mass M . Its centripetal acceleration, ac , is of course in the direction of the applied net force. In this experiment we shall use a spring t o supply the necessary centripetal force, see Figure 1.
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lab_16 - LAB 16 Circular Motion Introduction Our objective...

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