Explore how turning one spool now causes the other spool
to turn. Do they turn at the same rate? In the same direction?
Other possible explorations:
1) Mark a point on both spools and rotate them. Try using
one small and one large spool. How does the rotation of one relate to the
2) Put one twist into the rubber band, so that it forms
a figure-8 between the spools. Does this affect the rate of rotation? Does
it affect the direction of rotation?
3) Look at a bicycle's chain and gears. How is the spool
contraption similar to a bicycle? How is it different?