Tagged: experiment

A light puzzle - Physics Stop

Marcus Wilson Jul 13, 2015

Here's a puzzling photograph that Hans Bachor showed me at the end of the NZ Institute of Physics conference last week. It comes from his public lecture on lasers a week ago. And we don't have the answer to it, so maybe you can enlighten us (pun intended).  The photo is of a demonstration of total … Read More

NZIP2015 Highlights - Physics Stop

Marcus Wilson Jul 07, 2015

So the NZ Institute of Physics conference is in full swing. I have a bit of a break between the end of the last session and tonight's conference dinner, so there's time to give some highlights so far.  Well, first, the low-light: Like the rest of my family and half of Hamilton I've had a horrible cold. On … Read More

Lenz’s law – at 3 tesla - Physics Stop

Marcus Wilson May 20, 2015

When I was at school, and introduced to magnetic fields in a quantitative sense (that is, with a strength attached to it), I remember being told that the S.I. unit of magnetic flux density (B-field) is the tesla, and that 1 tesla is an extremely high B-field indeed. Ha! Not any more. Last Friday night  I got to see … Read More

Modes of a square plate - Physics Stop

Marcus Wilson Jan 15, 2015

Alison has drawn my attention to this video. It demonstrates vibrational modes of a square plate by using sand. At certain frequencies, there are well defined modes of oscillation, in which parts of the plate 'nodal lines' are stationary. The sand will find its way to these parts and trace out some lovely pictures.  Vibrational … Read More

Toddler does physics-art - Physics Stop

Marcus Wilson Oct 29, 2014

As we all know, a scientifically-minded toddler plus a piece of technology can lead to unexpected results. This is the result of Benjamin playing with a retractable steel tape measure at the weekend. How we came to break the case apart I don't know, but the results are pretty (the cellphone shot in poor light doesn't do justice to … Read More

Robot racing - Physics Stop

Marcus Wilson Oct 22, 2014

The Engineering Design Show is currently in full swing here, with the competitions for the various design projects. The white-line followers kicked off proceedings. They were pretty impressive, with all but one team successfully being able to follow the (very squiggly) line without mistakes. There were traps to confuse the robots - the line got thinner and … Read More