of 1-2cm from the bottom of the PVC pipe and place a tape marker.
             • Hold onto the PVC pipe and twirl the stopper in a constant horizontal circle and maintain a steady speed such that the distance between the tape marker and the PVC pipe remains constant.
             • When a constant speed is achieved, use the stopwatch to record the time for 20 revolutions of the object.
             • Repeat the experiment for M=150g and 200g.
             NOTE: The tension created by the weight of the mass at the B-end of the string is equal to the centripetal force that keeps the stopper in a circular path.
             • Obtain the time for the trials and calculate the frequency for each trial.
             • Plot a graph with centripetal force on the y-axis and the frequency on the x-axis.
             Experiment 2: Relationship between the radius and the frequency i.e. mass and velocity remain constant.
             • Measure and record the mass of one stopper with the chemical balance before use in the experiment.
             • Tie the stopper to a string with a length of approximately 1.5m.
             • Insert a thin cylindrical PVC pipe at the other end of the string.
             • Measure the length from the centre of the PVC tube to the centre of the stopper to be 75cm. I.e., radius=75cm.
             • Attach a mass, M, of 100g to the B-end of the string.
             • Measure a distance of 1-2cm from the bottom of the PVC pipe and place a tape marker.
             • Hold onto the PVC pipe and twirl the stopper in a constant horizontal circle and maintain a steady speed such that the distance between the tape marker and the PVC pipe remains constant.
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