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physics: mechanics
Mechanics is the study of force and motion. A mechanism is defined by two forces: the driving force (effort) and the resistant force (load).
double pulley system
System consisting of two pulleys with a rope running around them to lift a load. Using two or more pulleys reduces the amount of effort needed.
lever
System consisting of a bar pivoting on a fulcrum to lift a load. The amount of effort required is related to the position of the pivot and the length of the bar.
