mechanism consisting of a device that works on mechanical principles

a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal

a simple machine that gives a mechanical advantage when given a fulcrum

a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope

a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)