These laws have major implications for gravity. For instance, according to Newton’s third law, a rock falling toward the Earth is also exerting a gravitational pull is so small, though, that it can actually be ignored. However, for larger objects such as the Moon, this reciprocal effect cannot be ignored. In fact, the effect of the Moon’s pull on the Earth can be seen in the ocean tides. Newton was also able to demonstrate Kepler’s laws of planetary motion based on his own general laws of motion. The orbits of the planets, with the properties identified by Kepler some seventy years earlier, could be described from the ground up using the planets’ masses, accelerations, and the gravitational attraction of the sun.
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