DynaKars are fantastic devices for producing distance-time and velocity-time graphs. They are really engaging and my classes just love them. They are constantly asking me, "are we using the DynaKars today, Miss?"
"No, because we're learning about Biology..."
They are really easy to use and set up, just plug and play and the software is really accessible. It can plot different shaped graphs for motions, be used instead of a light gate for a whole journey, really used for any sort of motion analysis.
Another fantastic thing about them is you can easily find the area under the graph or the gradient to find acceleration or distance travelled, which makes them fantastic for KS3 or KS4.
The cars have hooks at their base so they can be accelerated with masses and pulleys and are a much more exciting form of the traditional trolley down a ramp (which is the only experiment any adult can ever remember doing when I tell them I'm a Physics teacher).
A really awesome little piece of kit, making motion graphs much more exciting!
is also a teacher and massive e-learning nerd.