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| | Newton's laws of motion - Wikipedia, the free encyclopedia |
 | | The laws of conservation of momentum, energy, and angular momentum are of more general validity than Newton's laws, since they apply to both light and matter, and to both classical and non-classical physics. |
 | | Newton's laws were verified by experiment and observation for over 200 years, and they are excellent approximations at the scales and speeds of everyday life. |
 | | (Although the bar magnets are not point particles, the same applies, for example, to point particles that have magnetic dipole moments.) In cases where the strong form applies (or where the forces involved are contact forces), Newton's laws can be used to prove conservation of angular momentum. |
| en.wikipedia.org /wiki/Newton's_laws_of_motion (2243 words) |
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