machines, techniques and simple ideas

Its these below 6 simple machines on which most of the mechanical devices, even advanced machines and their mechanics depend like todays heavy presses, lifting equipments at construction site, conveyor belts running over long distances etc…
1. lever: scissor, cart
2. wedge: axes, knives, hull of a ship, here force acts perpendicular to the inclined planes
3. screw: uses torque (archimedes deviced screw to lift water from deep holes)
4. axle and wheel: cart
5. pulley: cranes
6. inclined plane
few simple complex machines are
a. bicycle – lever, axle and wheel
b. car jack – screw, lever
c. lifts, trolleys – pulleys
d. roller-coaster – axle and wheel, wedge
e. windmill – pulley, axle and wheel, wedge