قرقره ها، قرقره های مرکب | فیزتک

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To lift any object, a person must do some work. Work is the product of the effort, or force, applied to an object multiplied by the distance the force is applied. The relation of work to force and distance can be show as an equation: Work = Force × Distance

فیزتک 43 دنبال کننده
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