What is Machine?
[[File:Hand_printing_press_(ubt).jpeg|thumb|An early printing press machine]] A '''machine''' is a thing that is created by people to make work easier. It is a [[tool]] or [[invention]] which multiplies the effect of human effort. The machine produces a [[mechanical advantage]]. Some machines have many parts that move. Examples are [[bicycle]]s and [[clock]]s. Some machines do not have parts that move. Examples are [[computer]]s and [[telephone]]s. People have used machines since before there was [[history]]. Often a machine will change one form of [[energy]] to another form of [[energy]]. Simple machines increase or change the direction of a [[Force (physics)|force]]. == Simple machine == There are six 'simple machines'. They are: * the [[Wedge (mechanics)|wedge]], * the [[Inclined plane]] (ramp), * the [[screw]], * the [[lever]], * the [[pulley]], * and the [[wheel and axle]]. Compound machines are made up of two or more simple machines. {{tech-stub}} [[Category:Machines| ]] [[Category:Basic English 850 words]]