Screw Jack - Human Lift

Purpose

To illustrate mechanical advantage.

Equipment

Screw jack, wood block, and wagon, as photographed.

Setup Time

5 min.

Images

b3-22

Description

The screw jack is used to lift the back end of the wagon with several people aboard. It can easily be operated with one hand, because it has a mechanical advantage of about 420 when used with a 22 inch handle.◙

References

(PIRA unavailable.)