Rubber Band Buggy
This is carried out as a scientific investigation, with the older groups this is discussed in greater depth. The various forces in action and other variables are discussed. The teams work in threes or fours, each team has a pre-made rubber band powered buggy and they investigate the distance travelled in relation to the number of twists of the rubber band. Each team collects their own set of results which they display on a large communal graph using their unique colour coded stickers. This graph and its variations are used as a focus of discussion. The graph is used to draw conclusions from/interpolate the number of twists required to travel a given distance. The students test it. It is helpful if the class have already been introduced to line graphs before my visit.