Simple machines

By : Lexie Gaten

• There are six simple machines, the lever, pulley, wheel and axle, inclined plane, wedge, and screw.

• There are 3 different classes of levers, the first class lever, 2nd class lever, 3rd class lever.

Mechanical advantage formulas -

• lever - MA = L (effort arm) / L(resistance arm)

• pulley - MA = 2n

• wheel and axle - MA = rw/ra

• inclined plane - MA = l/h

• wedge - MA = l/w

• screw - MA = 3.14d/ l

• 1st class lever - MA = d1/d2

• 2nd class lever - MA = d1/d2

• 3rd class lever - MA = d1/d2

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