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 more..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(noun.artifact)
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) (noun.artifact)
a motor vehicle with four wheels; usually propelled by an internal combustion engine(noun.artifact)
a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of ener more..a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy(noun.artifact)