conduction - heat moving to a colder matter, convection - process by which heat is transferred by movement of a heated fluid , radiation - transferor thermal energy, energy - necessary to do work, gear - toothed wheel, wheel and axle - wheel and rod, inclined plane - A plane set at an angle to the horizontal, especially a simple machine used to raise or lower a load by rolling or sliding, screw - A cylindrical rod incised with one or more helical or advancing spiral threads, as a lead screw or worm screw., wedge - A piece of material, such as metal or wood, thick at one edge and tapered to a thin edge, pulley - A wheel turned by or driving a belt, lever - A simple machine consisting of a rigid bar pivoted on a fixed point and used to transmit force,

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