Simple machines

The basic simple machines are:  

First class lever

mechanical advantage formula: ma=D1/d2

Second class lever

mechanical advantage formula: ma=d1/d2

Third class lever

mechanical advantage formula: ma=d1/d2

Wheel and axle

mechanical advantage formula:ma=rw/ra

Pulley

mechanical advantage formula: ma=2n

Inclined plane

mechanical advantage formula: ma=1/h

Wedge

mechanical advantage formula: ma= 1/w

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