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Velocity

How fast are you moving right now? Youtube via TED-Ed. 6 minutes 4 Star
       
Distance versus Displacement Very simple applet to demonstrate the difference between distance and displacement. 4 Star
Instantaneous versus average speed link Using the slope of a distance time graph, where you can vary the time interval 4 Star
       
Conservation of energy Lovely simulation which shows how a ticker-tape would look for a trolley demonstrating conservation of energy 4 Star
Displacement, Velocity and Acceleration Graphs A wonderful and fun series of exercises to help understand motion graphs. Not accessable from most schools because it is hosted on a blog site. 5 Star
Play with the different variables and see how the graph changes. 4 Star
  Wonderful graphing challenge - we'll come back to this in the next chapter 5 Star