In Pulleys, inhabitants of Mammoth Island try to find the best method to lift their mammoths. A young islander, Olive, decides to use a simple machine called a pulley to get the job done. A pulley is a wheel that carries a rope, chain or cable on its rim and can be used to lift a heavy load. And when multiple pulleys work together, they lessen the effort it takes to do work. So, using a ten-pulley system would require one-tenth of the effort of a single pulley to lift a mammoth!