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Any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks.
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 of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole.
A device for overcoming resistance at one point by applying force at some other point.
Something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them.
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)
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