In this paper, we acquire and analyse high-speed videos of a spring–mass system oscillating in glycerin at different temperatures. Three cases of damped harmonic oscillation are investigated and analysed by using high-speed video at a rate of 120 frames s−1 and Tracker Video Analysis (Tracker) software. We present empirical data for the three cases of damped motion in graphical form. We also provide graphical proof of the relationship between the damped angular frequency and the damping constant. Finally, we determine the quality factors and give graphical proof of the dissipated energy of damped harmonic oscillators due to the viscosity of glycerin at different temperatures. These results will be developed into teaching material on the topic of damped harmonic motion.

This study aimed to investigate and analyse rolling disc motion using a highspeed video analysis technique. Firstly, conditions of pure rolling must be satisfied. Secondly, three-dimensional high-speed videos of rolling discs were captured at 240 frames s −1 using three cameras placed perpendicular to each other. The videos were analysed with Tracker Video Analysis software to obtain experimental values of precession rates. The experimental precession rates for the small and big discs deviated by approximately 3.43% and 2.50% from the theoretical values, respectively. Finally, the angular momentum of the discs was determined from the measured parameters including tilt angles, precession rate and angular speed. Both discs rolled in a spiral path as a result of rolling friction causing the disc to slow down. High-speed videos and their analysis can be used as demonstrations or teaching media in advanced mechanics courses.

The objective of this work is make tissue adhesives agent from Thai rice starch, then test the final products for scientific and medical properties following the laws of Thai health ministry, to demonstrate that this product can be used safely, as same as the standard product. The principal raw material is pharmaceutical grade, Thai rice starch powder. The additives are hydroxyapatite (HA) nanopowder, carboxymethylcellulose, lactic acid, gelatin, polyvinylalcohol and glycerol. All materials will be mixed in distilled water under high temperature, and dried into starch tissue adhesives plate hydrogel. The final product will be kept in medical package and sent for sterilization by gamma radiation. These products will be characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), stability in water, and adhesive bond strength test in wet environment.

This study aimed to investigate student reasoning about harmonic oscillations. We conducted a semi-structured interview based on three situations of harmonic motions-(1) a mass attaching to spring and horizontally oscillating without damping, (2) the same situation but vertically oscillating and (3) a mass attaching to spring and oscillating in viscous liquid. Forty-five second-year students taking a vibrations and wave course at Chiang Mai University, Thailand participated in a fifteen-minute interview, which was video-recorded. The videos were transcribed and analyzed by three physics instructors. As results, we found that most students had misconceptions about angular frequency and energy mostly in the second and third situations.