Candace, Cecilia, Farhad Dancing and Sticking Salt Mystery

In this extension we had to figure out why salt bounces off conductors and why it sticks to insulators. The salt sticks to the insulator because the electrons can not pass through the pipe. The salt bounces off the conductor because the electrons in the salt are being repelled off the pie tin. Conductors carry a charge, but insulators do not. So the insulators can not attract objects with the opposite charge.