E-learning website: Andy Darvill's site is aimed at UK Secondary school science students, and contains online learning and downloads for Key Stages 3 and 4. There's also a page of revision tips.
Wave Superposition JavaScript Toy: This web page uses scalable vector graphics and JavaScript to draw three waves, the latter the superposition of the first two. You can show constructive and destructive interference, and also standing
NT Science- good website: www.ntscience.co.uk
A fantastic website with quizzes and wordsearches for ks3 topics