حلول التدريبات العملية حفظ كمية الحركة

1. حساب مقدار سرعة الجسمين U، بعد الاصطدام، نستخدم معادلة حفظ كمية الحركة (يتم حفظ كمية الحركة لأنه لا توجد قوى خارجية تعمل على هيئة الجسمين - هيئة مغلقة).  

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2. اتجاه حركة الجسمين بعد الاصطدام إلى اليمين. اتجاه حركة الجسمين عكس اتجاه المحور.

3. حساب مقدار الدفع الذي يشغله الجسم 1 على الجسم 2. 

    نستعمل قانون الدفع وكمية الحركة:

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يكون الدفع سالبًأ لأن الجسم 1 يشغل على الجسم 2 قوة في اتجاه عكس المحور. 

4.  حساب الدفع الذي يشغله الجسم 2 على الجسم 1. 

 حسب القانون الثالث لنيوتن، القوة التي يشغلها الجسم 2 على الجسم 1 تساوي القوة التي يشغلها الجسم 1 على الجسم 2 ، ولكن في الاتجاه المعاكس ، وبالتالي فإن الدفع يساوي: 

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أو يمكننا استخدام قانون الدفع وكمية الحركة: 

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