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In the INSTRUCTABLE "Solar Panel as a Shadow Tracker", it was presented an experimental method to determine the speed of an object from the projection of its shadow on a solar panel. Is it possible to apply some variant of this method to study rotating objects? Yes, it is possible. Next, a simple experimental apparatus will be presented that will make it possible to measure the period and frequency of rotation of an object. This experimental apparatus can be used during the study of the subject " Physics:Classical Mechanics ", in particular during the study of the topic "Rotation of rigid objects". It is potentially useful with undergraduate and graduate students, during experimental demonstrations or laboratory classes.

Step 1: Some Theoretical Notes

Picture of Some Theoretical Notes

When a solid object rotates around an axis, its parts describe circumferences concentric to that axis. The time it takes for one of these parties to complete the circumference is called the rotation period. Period and frequency are reciprocal magnitudes. In the International System of Units the period is given in seconds (s) and the frequency in Hertz (Hz). Some instruments to measure the frequency of rotation give the values in Revolutions per Minute (rpm). To convert from Hz to rpm, simply multiply the value by 60 and you will get the rpm.