Force x distance = Weight x distance,
or 2 x 2 = 4 x 1.
Move the 4-pound weight so that it is very near the fulcrum, say but 6
inches from it; then the spring balance registers a force only one
fourth as great as the weight which it suspends. In other words a
force of 1 at a distance of 24 inches (2 feet) is equivalent to a
force of 4 at a distance of 6 inches.