A block and tackle is an apparatus that utilizes what simple machine?
Pulley Pulley system Cranes-Pulleys Line and pulley Pulleys Fixed pulley Crowned pulley Compound pulley Second-class pulley First-class pulley Movable pulley
movable pulley crowned pulley compound pulley second class pulley fixed pulley first class pulley pulley line and pulley pulleys pulley system cranes pulleys
pulley
WikipediaEntity
Pulley