http://scratch.mit.edu/tags/view/science
http://scratch.mit.edu/tags/view/physics
http://scratch.mit.edu/tags/view/circuit
http://scratch.mit.edu/tags/view/electricity
http://scratch.mit.edu/tags/view/magnets
http://scratch.mit.edu/tags/view/light
http://scratch.mit.edu/tags/view/mechanics

conservation of linear momentum :
http://scratch.mit.edu/projects/eisaman/49252

reflex tester :
http://scratch.mit.edu/projects/forcemaster/99702

semi-realistic bowling :
http://scratch.mit.edu/projects/Yakkers/304559
http://scratch.mit.edu/projects/Yakkers/89751

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http://www.ordiecole.com/scratch/scratch_physics.txt