Below find an interactive model of a 1 [kg] blue glider running on a 10 [meter] airtrack, with timing gates separated by 1 [meter] whose traverse is timed by both lab frame (mapTime) and glider (travTime) clocks. Put your mouse over the model, and the glider will begin to move. The animation can be stopped and restarted with a double click. A version of this particular experiment run on our remotely-controlled "spacetime explorer" platform is available here.

While stopped, the red energy selector can be selected and dragged to new values on a logarithmic scale. This also resets the glider, which at low energies behaves as one might expect in an everyday lab experiment. At higher energies, mapTime and travTime begin to differ. After you take a bit of data, can you come up with a quantitative hypothesis for predicting the observed behavior? Could such things happen in the real world, and if so what might they mean?

Below find an interactive model of a 1 [kg] blue glider running on a 10 [meter] airtrack, with timing gates separated by 1 [meter] whose traverse is timed by both lab frame (mapTime) and glider (travTime) clocks. Put your mouse over the model, and the glider will begin to move. The animation can be stopped and restarted with a double click.

While stopped, the red energy selector can be selected and dragged to new values on a logarithmic scale. At sufficiently low energies, the glider behaves as one might expect in an everyday lab experiment. At higher energies, mapTime and travTime begin to differ. After you take a bit of data, can you come up with a quantitative hypothesis for predicting the observed behavior? Could such things happen in the real world, and if so what might they mean?

Below find an interactive model of two 1 [kg] blue gliders on a 10 [meter] airtrack, with timing gates separated by 1 [meter] whose traverse is timed by both lab frame (mapTime) and glider (travTime) clocks. The first glider collides and sticks to the second glider before they pass through the timing gates. Put your mouse over the model, and the glider will begin to move. The animation can be stopped and restarted with a double click. A version of this particular experiment run on our remotely-controlled "spacetime collider" platform is available here.

While stopped, the red energy selector can be selected
and dragged to new values on a logarithmic scale. *This
also resets the glider positions.*
At low energies, the gliders behave as
one would expect in an everyday lab experiment. At
higher energies, mapTime and travTime begin to differ.
After you take a bit of data, can you come up with
a quantitative hypothesis for the quantities that
are conserved in a collision?
Could such things happen in the real world, and if so
what might they mean?

This page is http://www.umsl.edu/~fraundor/nanowrld/newlive/fastrakp.html. Acknowledgement is due particularly to Martin Kraus for his robust Live3D applet. Although there are many contributors, the person responsible for errors is P. Fraundorf. This site is hosted by the