17 December 2010 at 14:08 #15364
The springs are a big wow factor – pull them out of shape and scrunch them up – then drop them in a beaker of hot water and they return to their original spring shape. You can also rig up a wire or spring such that a mass stretches it. When a current heats the wire or spring it returns to its original shape lifting the mass.
Themes: Materials, electricity, forces, investigations