Pull-the-string Sentence Examples

A pulley is one of the original simple machines. The pulley was possibly created by Archimedes in B.C. times. Its original use was to lift buckets of water. The term sheave can also be used to refer to a pulley.

Potential energy is stored energy from an object. Instead of coming from motion, it can come from its position relative to others, internal stress, electric charge, or its condition. This object has the capability of producing energy as these conditions change. This energy could be mechanical energy, chemical energy, electric energy, nuclear energy, or magnetic energy.