Simple MachinesSimple Machines : Simple machines are machines with few or no moving parts. They make work easier, user energy to work and change the direction of force.
They include lever, screw, wheel and axle, inclined plane, pulley and wedge.
Complex MachinesComplex Machines : Complex machines can be created by combining simple machines. They can be as small as a mechanical watch or as large as a construction crane.
Complex machines are also called compound machines. Two or more simple machines work together to form a complex machine. Compound machines can do more difficult jobs than simple machines alone.
Examples of complex machines are bicycle, wheel barrow, crane, car jack, lawn mover etc.
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