Common examples of simple machines include the hammer, crowbar, knife, log splitter, scissors, light switch, door knob, escalator, ladder, screwdriver, ramp, stairs, car jack, curtain cord and steering wheel. The six types of simple machines include the wheel and axle, inclined plane, simple lever, pulley, wedge and screw. The wheel and axle, simple lever and pulley constitute the lever family, while the inclined plane, wedge and screw are part of the inclined plane family.
A machine is an electrical or mechanical contraption that lightens a workload. It utilizes energy to alter the direction, increase the rate, transfer or multiply the force required to carry out a particular task. There are two types of mechanical machines: simple and compound. A simple machine is composed of only one mechanical apparatus, while a compound machine comprises two or more simple machines.
Simple machines provide a mechanical advantage, which is the factor by which a machine increases the magnitude of a force. The work output refers to the amount of work done by a machine, while the work input pertains to the amount of work exerted into the machine. The lever family exerts a rotational force that changes the direction of the work output from the work input. The inclined plane family alters the direction of work output at an angle of 90 degrees to the direction of the work input.