Tagged: electron

Anti-gravity - Physics Stop

Marcus Wilson Oct 28, 2009

There are some lovely physics demonstrations that get repeatedly wheeled-out for things like Open Day and visits from school groups. Things like holding a spinning bike wheel on a rotating chair (flip it over and you start rotating - conservation of angular momentum) and levitating a piece of superconductor above a magnet at liquid nitrogen temperatures.  But one thing that I've … Read More

Approximately speaking - Physics Stop

Marcus Wilson Oct 08, 2009

Physicists are notorious for making approximations.  This character trait is the subject of many jokes - for example, one rather rambling one involving a physicist advising a punter on which horse to put his money ends with the line "Oh, didn't I tell you - my calculations assumed a spherical horse rolling through a vacuum."But approximations are useful things. The … Read More