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Newton's First Law of Motion Concepts http://www.khanacademy.org/video/newton-s-1st-law-of-motion --------------------------------------------------------- يتناول هذا الفيديو شرحا عن مبدأ قانون نيوتن الأول للحركة --------------------------------------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org