By building simple machines, kids can learn the concepts of physics and mechanics in an exciting and tangible way. Before ...

Simple machines can be regarded as the elementary "building blocks" of which all more complicated machines (sometimes called "compound machines") are composed. For example, wheels, levers, and pulleys ...

A lever is a simple mechanism that uses a bar to pivot ... Linkages are found in many different machines, including folding chairs, windscreen wipers and the arm of a digger.