Attach the strings to a horizontal rod about 10 cm apart, as shown in Figure 1. Use the ring stand to hang the 200 g mass from two strings. Does the period seem to depend on the mass?ġ. Observing only with your eyes, does the period depend on the length of the string? Does the period depend on the amplitude of the swing?Ģ. Hold the string in your hand and let the mass swing. Make a pendulum by tying a 1 m string to a mass. Measure the period of a pendulum as a function of bob mass.ġ. Measure the period of a pendulum as a function of length. Measure the period of a pendulum as a function of amplitude. By conducting a series of controlled experiments with the pendulum, you can determine how each of these quantities affects the period. In this experiment, you will use a Photogate capable of microsecond precision to measure the period of one complete swing of a pendulum. Conducting controlled experiments is a basic principle of scientific investigation. To investigate the pendulum, you need to do a controlled experiment that is, you need to make measurements, changing only one variable at a time. The length of the pendulum, measured from the center of the pendulum bob to the point of support There are at least three things you could change about a pendulum that might affect the period (the time for one complete cycle): It is so regular, in fact, that for many years the pendulum was the heart of clocks used in astronomical measurements at the Greenwich Observatory. A swinging pendulum keeps a very regular beat.
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