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Simple Harmonic Motion

SHM

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!
From explorelearning.com
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 mathsphysics.com 4 Star
  link YouTube video from c4science 4 Star