A simple machine is a non-motorized device that changes the direction or magnitude of a force. Ithat provide mechanical advantage (also called leverage). Usually the term refers to the six classical simple machines part of engineering and applied science. For example, wheels, levers, and pulleys are all used in the mechanism of a bicycle.
The trucker’s hitch is a compound knot that functions as a kind of pulley affording a 3-1 mechanical advantage effectively tripling the amount of pull on the working end. I use the trucker’s hitch when tightening up tarp lines, securing loads or making bundles.