Unofre Pili, Renante Violanda
The angular velocity of a spinning object is, by standard, measured using a device called a tachometer. However, by directly using it in a classroom setting, the activity is likely to appear as less instructive and less engaging. Indeed, some alternative classroom-suitable methods for measuring angular velocity have been presented [1, 2]. In this chapter we present a further alternative that is smartphone-based, making use of the real-time magnetic field (simply called B-field in what follows) data gathering capability of the B-field sensor of the smartphone device as the timer for measuring average rotational period and average angular velocity. The in-built B-field sensor in smartphones has already found a number of uses in undergraduate experimental physics. For instance, in elementary electrodynamics, it has been used to explore the well-known Bio-Savart law (Chap. 62) [3] and in a measurement of the permeability of air [4]. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022. All rights reseverd.
University of San Carlos, Cebu, Philippines
