الفعل ورد الفعل ♠ ♠ ♠ مجلس أبوظبي للتعليم منطقة العين التعليمية

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Presentation transcript:

الفعل ورد الفعل ♠ ♠ ♠ مجلس أبوظبي للتعليم منطقة العين التعليمية مدرسة المعالي النموذجية Action And Reaction ♠ تتوجد القوى في الطبيعة على شكل أزواج، ولايمكن أن توجد على شكل منفرد. 2 1 Examples أذا أثر الجسم على الجسم بقوة، فإن الجسم سيؤثر على الجسم بقوة مساوية لها في المقدار ومعاكسه لها في الأتجاه. 2 1 2 1 ♠ ♠ لماذا تنحني إصبعك؟! ادفعي الجدار (أو الطاولة) بأصبعكِ، ماذا تلاحظين؟!! القانون الثالث لنيوتن: لكل فعل رد فعل يساوية في المقدار ويعاكسه في الاتجاه. كلاً من الفعل ورد الفعل يؤثران في جسمين مختلفين، لذلك لا يمكن حساب محصلة لهما. الحصان يُحدث نفسه، إذا سحبت العربة بقوة إلى الامام فإن العربة تسحبُني بقوة للخلف تساوي قوتي بالمقدار، ولذلك فلن أستطيع أبداً أن أتحرك أنا والعربة مهما حاولت. هل تفكير الحصان صحيح، ولماذا؟!

في الشكل المجاور : عللي : يرتد المدفع قليلاً للوراء؟!-1 -2 أيهما أسرع انطلاق القذيفة أم ارتداد المدفع؟! -3 ”الفعل يساوي رد الفعل في المقدار و يعاكسه في الاتجاه“ لم الاختلاف في سرعة كل من القذيفة والمدفع؟!!!