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HISTORY OF SIMPLE MACHINES

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Simple Machine

The history of machines dates back thousands of

years

the lever is believed to be the first simple machine

that was utilized by humans

It makes the work simpler and with less effort

Machines can transform natural energy, such as

wind and falling water, into work and electricity Industrial Revolutions elsewhere brought about the

invention of even more complex machines

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principle of the lever was often utilized

through the rotary motion of the wheel and

axle

During the Middle Ages, attacking armies

used a similar device for lifting soldiers over

fortress walls

crow bar and claw of the hammer

balance scales and keys of the piano

simple machine consisting of a rigid bar that

rotates about a fixed point, called a fulcrum

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History of Pulley

simple machine used to lift objects.

consists of a grooved wheel or disk within a

housing, and a rope or cable threaded around the

disk

reduce the effort to lift an object by increasing

the distance over which the effort is applied

early peoples lifted heavy objects by throwingvines or other crude ropes over tree limbs

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History of Inclined Plane

consisting of a ramp or a similar wedge-shaped

device, that makes doing a given amount of work

easier

Egyptians created earthen ramps to raise huge

blocks of stone during the construction of the

pyramids, from about 2700 BC to 1000 BC

Egyptians used a lubricant, probably milk, toreduce the sliding friction and thus increase the

efficiency of the inclined planes.

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History of Wheel and Axle

consisting of a circular objectthe wheelwitha shaftthe axlerunning through and attachedto the center of the wheel

Wheels and axles have been used for centuriesto magnify force

it made transportation much easier inMesopotamia as early as 3500 BC.

Windmills and waterwheels (both forms ofwheel and axle) were combined with gearing tomake mills for grinding grain

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