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As there is no external torque acting on it, its angular momentum remains constant. This is according to the law of conservation of angular momentum
Law of conservation of momentum applies to any body on which no external torque is acting.
For example, various conservation laws (conservation of mass, of energy, of momentum, of angular momentum, of electric charge), Newton's Second Law, the Universal Law of Gravitation, etc.
More or less. There is a law of conservation of angular momentum, according to which Earth can't gain or lose angular momentum on its own - if for example it loses angular momentum, it has to go somewhere. A meteor who falls into the Earth, or a rocket leaving the Earth can change Earth's angular momentum - but the total angular momentum (e.g., of the system meteor + Earth) is the same, before and after the impact.
There are many laws of conservation. Some of the better-known ones are the law of conservation of energy, of momentum, and of rotational momentum.There are many laws of conservation. Some of the better-known ones are the law of conservation of energy, of momentum, and of rotational momentum.There are many laws of conservation. Some of the better-known ones are the law of conservation of energy, of momentum, and of rotational momentum.There are many laws of conservation. Some of the better-known ones are the law of conservation of energy, of momentum, and of rotational momentum.
Do you mean what Law of Conservation keeps the Earth spinning at the same rate? If so, that's the Conservation of Angular Momentum.
The law of inertia was invented (or discovered) by Isaac Newton. Tops were known since ancient times, such as the dreidel. But Newton is credited with the conservation of angular momentum, I believe.
Conservation of momentum is an absolute symmetry of nature
You have more or less described a law of physics known as conservation of momentum, which is not the same thing as the law of universal gravitation. The law of universal gravitation describes the way mass attracts other mass, and the law of conservation of momentum tells us that momentum is neither created nor destroyed. These two laws are not connected.
That description sounds more like the law of Conservation of Angular Momentum.
The law of conservation of angular momentum. The earths rate of rotation is slowing due mainly to the drag of the tides caused by the moon. To conserve the angular momentum in the earth/moon system the moon has to recede. The moon isn't moving.
The momentum before and after is the same, due to the Law of Conservation of momentum. Thus if you calculate the momentum before, then you have the after momentum or vice-versa.