A bead chain hangs over a light pulley as seen in the photograph below; the two ends of the chain are hanging into small glass beakers. When the beaker on the left is lifted up a few centimeters, what will the chain do? There are three possibilities: the chain can move in either direction over the pulley or it can remain still.
When the left beaker is slowly lifted up a short distance, the chain will:
Click here for Answer #156 after September 22, 2003.
