Levers and Jacks

This video shows a clever mechanical mechanism used in this lever type jack. Suitable as a resource when teaching about simple machines.

Source: Hila Science Videos

Julius Sumner Miller - Levers and inclined planes

This is Julius Sumner Miller and physics is his business!  Here he shows that all simple machines can be considered as a lever or as an inclined plane.

Other physics demonstrations by Julius Sumner Miller

Eureka! Episode 15 - The Pulley

Eureka! shows viewers how a pulley works to lift a heavy object. If you double the number of ropes supporting the weight, you double the mechanical advantage.

Other Eureka episodes

Eureka! Episode 14 - The Screw and The Wheel

This program provides examples and definitions of a screw and a wheel; a screw is simply a twisted inclined plane; a wheel is simply a circular lever, whose fulcrum has become an axle.

Other Eureka episodes

Eureka! Episode 13 - Mechanical Advantage and Friction

Professors A and B compare the mechanical advantage of an inclined plane with that of a lever.

Other Eureka episodes

Mechanical Advantage - Pulleys

Mechanical advantage of a fixed pulley, a movable pulley and a chain block.