This paper presents a new and simple methodology to measure the magnitude of gravitational acceleration using a smartphone magnetometer sensor. In this way, we determine the temporal behavior of the magnet’s position previously fixed at different spacings along a ruler in a free-fall movement. The experimental data are interpreted within the theoretical model of the free fall of bodies to determine the magnitude of the gravitational acceleration. Results show a value close to those obtained by similar methods using other smartphone sensors and a theoretical model near Earth’s surface. Thus, we show a suitable methodology for the classroom, laboratory, or home experimental and inquiry activities.

Advances in microelectromechanical systems (MEMS) technology and the manufacture of integrated silicon circuits have made it possible to produce magnetic sensors, accelerometers, and gyroscopes with low cost, high efficiency, and low power consumption.1 A single package with these sensors is called an inertial measurement...

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