8. 8.1-


حسب تعريف الشغل:

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هندسيًا ، يمكن ملاحظة أن الزاوية بين اتجاه القوة واتجاه الحركة ? تساوي زاوية ميل المستوى «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathvariant=¨bold¨ mathcolor=¨#0000FF¨»«mo stretchy=¨true¨»(«/mo»«mrow»«mn»180«/mn»«mo»-«/mo»«mi»§#945;«/mi»«/mrow»«mo stretchy=¨true¨»)«/mo»«/mstyle»«/math» ، وقيمة الزاوية ? هي 120 درجة.  

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