physi

2 Ice Cubes: one is placed on a cork mat (an insulator) and one on a metal surface (conductor). Because the metal is a conductor it is able to conduct thermal energy to the ice cube (and take it from the surroundings) much more quickly than the cork mat. The ice cube on the metal has completely melted while the cork mat has hardly made a dent.

This experiment also demonstrates that air (as with any gas) is a good insulator. If air was a good conductor, then the ice on the metal might have melted marginall

A potential difference is induced across the brass pendulum, and the current flows such that it opposes the motion of the pendulum (due to Lenz's Law).

Brass is not a magnetic material, so the magnet is not slowing down by attracting the brass (as shown by the fact that the pendulum with slits in is not slowed down). However, when the pendulum with slits in is swung through the magnetic field, the eddy currents (which cause the pendulum to slow) are not so free to move within it. Thus Lenz's Law does not

Various demonstrations of the polarisation of light: 1, 2 and 3 in various arrangements.

This song is so irritating, and is one of those songs that gets stuck in your head and you can't ever get rid of it. A bit like a tumour.

But that's what's so good about it!

Watch this song once or twice and you will forever know the order of waves in the electromagnetic spectrum.