We are starting our session with 1st Llangynidr cubs next week with making (and obviously then racing!) toy cars powered by inflated balloons. We will then go on to explore the energy required to move cubs around – on foot, by bike or in a car or school bus.
Inflated balloons as a source of energy might seem a bit academic but it transpires that there are now experiments using giant balloons to store energy under high pressure deep underwater. http://www.sciencealert.com/underwater-balloons-could-give-us-a-new-way-of-storing-renewable-energy