Analyzing a torsion pendulum using a smartphone’s sensors: mechanical energy conservation approach

In this study, a physical pendulum experiment, which is one of the basic experiments at the high school level, was carried out using Lego bricks and smartphones (Phyphox application) that students are familiar with in their daily lives. In this way, it is aimed to provide an example to students and teachers about low-cost, theory-compatible experiments that students can perform on their own in out-of-school environments, especially in mechanics. In addition, another aim of the study was to record the experiment on video and analyse it with a video analysis program (Tracker) and to compare the two methods (using a smartphone application and a video analysis program) in terms of results and usability.

Section: Introductionmentioning

confidence: 99%

A physical pendulum experiment with Lego, Phyphox and Tracker

Coramik,

İnanç

2023

“…Salinas et al used the accelerometer of a smartphone to visualize and demonstrate the parallel axis theorem in a torsion pendulum [3]. Namchanthra et al also studied a torsion pendulum using the sensors of a smartphone (gyroscope and accelerometer) and demonstrated the conservation of mechanical energy [4]. Monteiro et al studied the rotational energy of a physical pendulum using the gyroscope sensor of a smartphone [5].…”

Section: Introductionmentioning

confidence: 99%

Teaching the moment of inertia by measuring the angular speed with a smartphone’s sensors

Puttharugsa¹,

Chatchawaltheerat²,

Teeratchanan³

2021

Self Cite

This paper demonstrates the use of the sensors of a smartphone in recording experimental data for studying the moment of inertia of a compound pendulum. The smartphone was attached to the beam to record at various points the angular position and angular speed of a compound pendulum. We altered the position of the smartphone along the beam resulting in the change of the system’s moment of inertia. The experimental result agreed with the theoretical calculation. This experiment will stimulate students to conduct such an experiment themselves and helps students understand the relationship between angular speed and its moment of inertia.

“…It is for this reason, in part, that we present in this work a quite unfamiliar use of a magnetic door alarm in measuring the gravitational acceleration, a simple pendulum-based, along with a smartphone sound sensor. While the use of smartphones is well-known [2,3], the use of the door alarm system appears to be unfamiliar-magnetic switches have been employed in other motion experiments but with a less accessible data acquisition setup [4] -and thus it would likely look exciting to the students, easing the learning process most probably. As an apparent audio-based demonstration of the periodic motion of the simple pendulum is a seen benefit embedded in the setup.…”

Section: Introductionmentioning

confidence: 99%

Sound-based measurement of g using a door alarm and a smartphone: listening to the simple pendulum

Pili¹

2020

Mainly, a door alarm system is used to measure gravitational acceleration. The magnetic switch component of the door alarm is turned on or off as the magnetic pendulum bob approaches or recedes from it. The audio signals is recorded by a smartphone as a time series, permitting the measurement of the period of oscillations and thus the determination of the gravitational acceleration. A satisfactory match between the experimental and the locally accepted value is attained. The setup is also an apparent audio-based demonstration of the periodicity of the motion of the simple pendulum.