主播大秀

Children from New Invention Junior School in the West Midlands investigate two ways that vehicles may be driven - energy directly applied to the axle and energy that is separate from the axle. The children make either wind-up rubber band cars or balloon-powered rocket cars. The children discover that the cars with two carefully placed balloons work much better than the others; but could the two balloons be arranged in a different way so that even more of the stored potential can be released?