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www.nuffieldfoundation.org/practical-physics practical gcse
sciencedemo.org Demonstrations
http://homeschool.scienceprojectideasforkids.com/2012/torque-rotating-force/
https://www.exploratorium.edu/science_explorer/roto-copter.html
http://www.origami-instructions.com/origami-helicopter.html
www.schoolphysics.co.uk/cd
www.arvindguptatoys.com/toys.html
Alan Weller
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Updated on Nov 24, 15 Created on Jun 13, 14
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