Tracker Software and Video Analysis of a Ball in Free Fall

Samo Božič
samo.bozic@zrss.si
Zavod RS za šolstvo

Povzetek

Uporaba računalnika kot merilne naprave je eden izmed ciljev pri pouku fizike že v osnovni šoli. Računalnik je s pomočjo digitalnega fotoaparata in programa Tracker mogoče spremeniti v učinkovit merilni sistem. Tracker je brezplačen program, ki omogoča pridobitev podatkov o gibanju telesa z analizo videoposnetka. Spreminjanje lege telesa v odvisnosti od časa določimo na podlagi lege telesa na zaporednih posnetkih in s poznavanjem časa med njimi. V predstavitvi bo prikazano delovanje programske opreme na praktičnem primeru analize prostega padanja žoge, ki je primeren za uporabo pri osnovnošolskem pouku fizike.

Ključne besede: Tracker, videoanaliza, meritev, fizika, osnovna šola.

Abstract

The use of a computer as a measuring device is one of the objectives of physics instruction in primary school. The computer used together with a digital camera and Tracker software can be transformed into an effective measurement system. Tracker is a free software which allows obtaining data on body movement by analysing a video clip. Changing the position of the body as a function of time is determined on the basis of body position in successive frames and knowing the time between them. The presentation will show the use of this software with a practical example of the analysis of the free fall which is suitable for use in elementary physics.

Key words: Tracker, video analysis, measurement, physics, primary school