To create extreme force with little effort on the part of the user, which system is best used?

Wheel and axle system, as found in vehicles

Explanation

“Mechanical device” is too broad a term to accurately identify the best source of power for the least amount of effort. A conveyor belt does not require external effort, but is instead purely mechanical. Pulley systems require greater effort on the part of the user than a wheel and axle system. For this reason, wheel and axle systems are the greatest source of power for the least amount of effort.

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