The document discusses different types of simple machines: 1) A wheel and axle rotates around a fulcrum and is used in devices like skateboards and bicycles to reduce friction. 2) A wedge splits or holds things together, examples being axes and zippers. 3) Pulleys make work easier by lifting things using gravity, seen in flagpoles and blinds. 4) Levers use a fulcrum to transfer force, exemplified by seesaws and snow shovels. 5) A screw has a grooved surface and turns on an axle to assemble or close things, as in screws and corkscrews. 6) Inclined planes like ramp