- Richard Jones gave an entertaining demonstration of a number of physics toys.
- Crookes’ radiometer – an apparent perpetual motion machine, but actually dependent on radiant energy. Originally designed by Crookes to demonstrate differential radiation pressure between black & silvered surfaces, it actually rotates in the opposite direction because dominant effect is differential heating of residual air molecules on each side of a vane (https://en.wikipedia.org/
- Optical corner reflector – how to see yourself as others see you!
- Super-magnet dropped down inside copper tube – retardation due to eddy currents (e.g. https://en.wikipedia.org/wiki/
- Fridge magnets (Halbach array – explanation of how stick to fridge via asymmetric magnetic flux – https://en.wikipedia.org/wiki/
- Spinning hard-boiled & fresh eggs – effect of internal fluid rotation on angular momentum
- Spinning celts (rattlebacks / wobblestones) – appear to violate conservation of angular momentum of a slightly asymmetric curved body owing to friction (https://en.wikipedia.org/
- Screeching tins (Cuíca musical instrument – https://en.wikipedia.org/wiki/
- Ring vortex generator (https://en.wikipedia.org/
- Drinking duck – another example of an apparently perpetual motion machine, dependent on evaporation of a liquid by absorption of external radiation (https://en.wikipedia.org/
- Super-magnet: picking up spent match, also demonstrating diamagnetism using a grape torsion balance
Donald Rintoul also demonstrated a Stirling engine which he had brought along, and which could be driven by placing over a cup of hot water, or even using hand heat.