model of simple online collaboration with video

Page history last edited by Geoff Roulet 11 years, 11 months ago

This is the teacher's introduction where they set up the problem and provide GeoGebra with the initial settings.

When a person holding a flashlight walks towards us the light gets brighter. We are going to investigate this situation and build a mathematical (function) model for the changing light intensity.


Click on the image below to get a video that explains the task more fully.


Unable to display content. Adobe Flash is required.


The spreadsheet in GeoGebra contains the light intensity measured at various distances. Construct a function model for this situation.


Use the GeoGebra applet below to work on the problem.


problem start - GeoGebra Dynamic worksheet

problem start


This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com


Geoff, Created with GeoGebra


When you have some ideas on how to start the problem and have tried them out in GeoGebra, create a Jing video showing your actions and the thinking behind them. Create a new page linked to this one and on the page place your Jing video and the GeoGebra sketch as you have left it.


If some people have already worked on the problem look at what they have done and visit their GeoGebra sketches.  When you see a place where you can contribute to the solution create a Jing video showing your work in GeoGebra and explaining your thinking. On the page where you joined the solution process create a link to a new page where you will  add links to your Jing video and the revised GeoGebra sketch.


Bob's contribution






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