School No.: 893Name: Lim Shu HuiGroup Members: Tiong Chi Kai, Tay Quan Lin and Lim Chung HengPractical Investigation 1: Circular MovementObjective of the Experiment: Study the relationship between centripetal force FC and rotation period in uniform circular motionAssumption:F is inversely proportional to T^2 which causes circular motionApparatus and materials:Electronic scale, weight and weight holder, paper clip, meter ruler, plastic handle , string, stopwatch and rubber stopperTheory: The rubber stopper maintains a uniform circular motion provided by the force Fc as shown in the drawing above. The formula for this force is specified asFc = mv^2/rNewton's second law gives that:Fc = mac ①The centripetal acceleration is given the formula: ac = v^2/r ②By replacing ② in ①,Fc = m (v ^2/r), thus the formula Fc = mv^2/r is proven. Fc = mac, m symbolizes the mass of the object, ac is the centripetal acceleration. Fc = mv^2/r, m represents the mass of the object, v is the speed of the object while r is the radius from the center of the circle to the object. When an object moves in a circular path, the net force is called the centripetal force. Centripetal force is a force that is always directed along the radius toward the center of the circle. Whenever an object moves in a circular path, the object is constantly pulled toward the center of the circle and away from its tangential path. If the rope breaks, the object will fly off at a tangent. Fc, which is the centripetal force exerted on the object, is provided by the tension of the string. The tension of the string is......in the middle of the paper......as squeezing the plastic handle tightly to prevent the plastic handle from moving while the rubber stopper is moving will avoid random errors during the experiment. Systematic errors can be avoided by periodic calibration of the equipment. The systematic error in air resistance can be reduced by performing the experiment in a vacuum. Systematic error can be minimized by improving experiment skills through completing multiple practices. Conclusion: The mass of the rubber stopper obtained is 12.60 g. The percentage error is 10%. The graph is a line graph, so it is a straight line and the systematic error and random error are significant to each other. The graph of 1/T^2 versus Fc is a straight line through the origin. As a result, the hypothesis is proven that F is inversely proportional to T^2, which causes circular motion..