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In this paper, we show how to construct a time marker similar to that adopted by the PSSC (Physical Science Study Committee) using an aquarium air pump and a hydrographic pen. We also show how this marker can be used either to register the motion of an object from the dots printed on a paper tape attached to the object, or to measure time intervals with the aid of electronic techniques to automatically start/stop its functioning. The suggested experiments allow students to learn the relationship between displacement, velocity, and time associated with a uniformly varied motion, as well as studying the physics related to translation and rotation dynamics.

Uso de um compressor de ar para aquário como marcador de tempo em experimentos de cinemática