تطفو الكرة فوق الماء بسبب مبدأ الطفو والقوى التي تعمل عليها. عندما توضع جسم ذو كثافة أقل من كثافة الماء في السطح، تتولد قوة دافعة تساعده على الطفو والبقاء فوق سطح الماء. وهذا يعود إلى اختلاف كثافة الجسم والماء.
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