Friday, 22 July 2011

Physics Beams in Holiday Session

Today students attended SMAF for a physics holiday workshop.
The students started the day with a presentation from a scientist at Flinders University.

Dr Rachel Popelka-Filcoff is currently an AINSE (Australian Institute of Nuclear Science and Engineering) Research Fellow and Lecturer based at Flinders University. She has won numerous awards and presented her research on the application of neutron activation analysis to Aboriginal Australian artefacts. Dr Rachel Popelka-Filcoff is working with collaborators on a project to characterise ochre and related pigments from regional and national sources in Australia.  This project uses several elemental and spectroscopic techniques to "fingerprint" ochre and minerals from geological sources, and understand uses of the pigment on archaeological sites, artefacts and objects.
Her talk demonstrated the interdisciplinary nature of science and provided an authentic example of cross curriculum priorities with physics and Indigenous perspectives.
Dr Rachel Popelka-Filcoff
Photo by Ashton Claridge, Flinders University.  

Students participated in a number of activities to investigate the principles they had learnt by theory in their physics lessons. For example magnetic field produced by a current, motion of a charged particle in a magnetic field and a hand generator.
Student showing how angular momentum speeds up
and slows as he brings his arms in or
spread out carrying weights.

Centripital motion
The force on a current in a magnetic field
The current passes through a strip of aluminium foil. The movement of this foil shows the size and direction of the force.

The foil is placed in the magnetic field of a large permanent magnet and connected to the power supply.

The force between two currents
When the currents are in the same directions
the aluminium strips attract each another.
The force between two currents
When the currents are in opposite directions
 the aluminium strips repel one another.

Deflecting electron beams in a magnetic field

The deflection tube uses an electron gun to inject electrons into a region of nearly uniform magnetic field perpendicular to the beam. In this region a magnetic field acts on the charge, producing a uniform acceleration in the direction perpendicular to the magnetic field and to the velocity of the electrons. Each electron experiences an acceleration that is always at right angles to its velocity. You should recognise this as a recipe for circular motion by now.

Teltron Tube

Generating Electricity

Students tested how many amps they could produce.

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