simple machine
mechanical device that changes the direction or magnitude of a force
cogwheel
rotating wheel having teeth which mesh with another cogwheel or toothed part, used to transmit torque, convert rotation to translation or rarely other purposes
crank
mechanism where an arm attached to a rotating shaft by which circular motion is imparted to the shaft
pulley
type of simple machine; wheel on an axle or shaft fixed in a frame; used to change of direction of a cable
inclined plane
tilted flat surface; flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load
screw
mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force; one of the six classical simple machines
windlass
apparatus for moving heavy weights, consisting of a horizontal cylinder (barrel) rotated by the turn of a crank or belt; a winch is affixed to one end, and a cable is wound around the winch, pulling a weight attached to the opposite end
scissors mechanism
uses linked, folding supports in a criss-cross 'X' pattern
wheel and axle
simple machine which consists of a wheel attached to a smaller axle
lever
simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum
wedge
mechanical device; triangular shaped tool; portable inclined plane; one of the six classical simple machines
screw
fastener that has a thread wrapped around a cylinder
reach extender
handheld mechanical tool used to increase the range of a person's reach when grabbing objects
wheel
circular item that rotates about an axial bearing; one of the six simple machines