CAROL & MIKE WERNER / VISUALS UNLIMITED, INC / SCIENCE PHOTO LIBRARY CAROL & MIKE WERNER / VISUALS UNLIMITED, INC / SCIENCE PHOTO LIBRARY
A Class 2 pulley has a free or movable axle, meaning the pulley is free to move in space. A movable pulley multiplies the lifting force by a factor of two, giving it a mechanical advantage of 2.
Model release not required. Property release not available.