101. 2022年5月22日 07:11:58 : Puig1cU9aI : b20zLmRjZ1ZoUWM=[1]
Newton's third law of motion (still pending ?) (クリ)
Not a few books and websites refer to the third law as law of two bodies. Newton's original text is neglected. Third law is a law at the point of action of a force. Now, a piller with mass m is lying on the horizontal plane (without friction). If the piller is continuously pulled to the right, it will be accelerated to the right. At the right end of the piller, magnitude of action-reaction is the same ma. Also, at the other positions (points of action) of the piller, magnitude of action-reaction is the same. This is a single body (even a chain).
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