تم الإجابة عليه: كيف يمكن رفع جسم ثقيل باستعمال بكرات متعدده

ج. يساعد نظام البكرات في تغيير اتجاه القوة المبذولة فسحب الحبل إلى أسفل يرفع الجسم لأعلى كما يمكن لنظام البكرات مضاعفة القوة المبذولة فيبذل جهد بسيط لرفع الجسم

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تم الإجابة عليه: كيف يمكن رفع جسم ثقيل باستعمال بكرات متعدده

أخر المواضيع من قسم : اسألني