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Simple Harmonic Motion


This is one of the best available. Click on "bar chart" and then on "graph" and it gives you an introduction to the sin wave.
Watch out - you're limited to 5 minutes!
May only work in Internet Explorer

5 Star
  Nice applet for demonstrating that acceleration is a maximum when velocity is a minimum. 4 Star
  Very useful introduction to SHM, although many of the concepts are above leaving cert level 4 Star
  Similar to above 4 Star
SHM of a shadow Useful to demonstrate the connection between circular motion and shm. YouTube 15 secs 4 Star

Is The Moon Held Up By A Spring? How Perspective Shapes Reality

YouTube. 4 mins  
Pendulum wave demonstration YouTube 2 minutes. Should we make this? 4 Star
  YouTube 2 minutes. Even prettier 5 Star
Want to buy one? Not too expensive either!  
  Link large-scale demonstration of the interaction between period and pendulum length, using 16 bowling balls hung from a wooden frame. Youtube. 3 mins.  
Hooke's Law Excellent simulation of the experiment. Hang different weights and measure the extension. From pHet. 5 Star
  link Also from pHet. Here the force is applied horizontally and it's straightforward to change the variables and take readings. 5 Star
Mandatory experiment      
Investigation of relationship between period and length for a simple pendulum and hence calculation of g   link Nice simulation from 4 Star
  link YouTube video from c4science 4 Star