How can I keep a marble in motion for 2 minutes?
I've had 2 suggestions so far:
*A simple way would be to put a marble in a bucket and move the bucket so the marble spins along the walls.
*Another idea is to have a teeter-totter, using a long plastic tube. Have a string attached to...
I have though of a puzzling part of refraction that has caused a bit of a problem. it is that if the light slows down then where does it get the energy from to speed back up once it has left the medium it was refracted into?