This is an interactive GeoGebra page controlled by the mouse. Change the mass of particles and move them around and the Centre Of Mass (COM) will move instantaneously.
You can use this page without downloading anything by clicking here.
I hope the controls are pretty straightforward. You can drag the points A, B, C, D, E around with the mouse.
A slider controls how many particles you have and their masses.
Hide and show the COM with the checkbox, so you can set up a question on the board and then reveal the answer.
Another idea is to hide one of the points behind an image (you can Ctrl-C, Ctrl-V an image into Geogebra easily) and then the class have to work it out using the COM.
Other ideas for using it? How could I make this better? Please get in touch on Twitter or comment on my blog.
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