Inclined plane. One of the six; screw, wedge, incline plane, pulley, wheel and axle, and lever.
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Axle
drill, dowel
The incline plane is the simple machine that starts with an I. The other five are wheel and axle, wedge, lever, screw and pulley.
ice molder, inclined plane, incubartor
A machine that starts with O is an oscillating fan.