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نعم ، يُغير الجسم اتجاه حركته.
يتم تحديد إشارة السرعة وفقًا لاتجاه الحركة بالنسبة للمحور ، إذا كان الجسم يتحرك في اتجاه المحور تكون السرعة موجبة. وإذا تحرك الجسم عكس اتجاه المحور، تكون السرعة سالبة.
قبل اللحظة t = 16s تكون سرعة الجسم موجبة ، وبعد اللحظة t = 16s تكون سرعة الجسم سالبة ، لذلك في اللحظة t = 16s يغير الجسم اتجاه حركته.
بمجرد أن يغير الجسم اتجاه حركته ، فإن سرعته تساوي صفر متر في الثانية ، ولكن ليس دائمًا عندما يتوقف الجسم ، فإنه يغير اتجاه حركته.
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يجب حساب التسارع في كل مقاطع الحركة، ويجب وصف الرسم البياني للتسارع كدالة للزمن وفقًا لذلك.
في التمثيل البياني للسرعة كدالة للزمن، يكون ميل الرسم البياني مساويًا لتسارع الجسم.
نحسب ميل الرسم البياني في كل جزء من أجزاء الحركة :
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نصف الحركة في الرسم البياني للتسارع كدالة زمنية ، وفقًا للتسارع الذي وجدناه ووفقًا للأزمنة التي يتحرك فيها الجسم في كل جزء من الحركة:

من اللحظة t = 8s حتى اللحظة t = 20s ، تغيرت إشارة السرعة ، لكن إشارة التسارع لم تتغير ، في الرسم البياني للتسارع كدالة للزمن في مقطع الحركة هذا لا يوجد تغيير في التسارع .
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لا يعود الجسم إلى نقطة البداية.
من الضروري أن نفهم كيف يتحرك الجسم ، من الرسم البياني يمكنك أن ترى أن الجسم يتحرك في البداية في اتجاه المحور ، ثم يتحرك عكس اتجاه المحور.
في الرسم البياني للسرعة كدالة للزمن، فإن معنى المساحة المحصورة بين الدالة ومحور الزمن تعني إزاحة حركة الجسم. تصف المساحة المحصورة فوق محور الزمن إزاحة الجسم في اتجاه المحور ، وتصف المساحة المحصورة تحت محور الزمن إزاحة الجسم في حركته عكس اتجاه المحور. نظرًا لأن المنطقة فوق المحور أكبر من المنطقة الواقعة تحت المحور ، فيمكن تحديد أن الجسم لا يعود إلى نقطة البداية.
في البداية ، تكون قيمة الدالة صفرًا وفي النهاية تكون قيمة الدالة صفرًا. لكن الرسم البياني يتعلق بالسرعة وليس بالموقع. بالإضافة إلى ذلك ، إذا كان هناك تردد حول مقدار المساحة، ليس من الواضح أيهما أكبر، يجب عندها حساب مقدار المساحة المحصورة أعلى وتحت المحور الزمني.
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* يتناول القسمان د و هـ موضوع المتجهات والديناميكا ، ولا يمكن الإجابة على هذه الأقسام باستخدام مبادئ الكينماتيكا وحدها.

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من اللحظة t = 8s حتى اللحظة t = 20s ، يتحرك الجسم بتسارع ثابت ، يساوي أيضًا تسارع الجسم في اللحظة t = 16s. في مقطع الحركة هذا ، يكون ميل الرسم البياني للسرعة كدالة للزمن سالبًا ، وبالتالي يكون التسارع سالبًا أيضًا.
نجد التسارع بواسطة حساب ميل الرسم البياني بين الزمن t = 8s و t = 20s.
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إذن ، فإن تسارع الجسم في اللحظة t = 16s تساوي 1.25 مترًا لكل ثانية تربيع.
في اللحظة t=16s ، تكون سرعة الجسم تساوي صفرًا ولكن يوجد تسارع للجسم.
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