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# What is gravity inertia?

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Inertia is the tendency for an object to remain in motion or at rest unless it is acted upon by an outside force. In the field of physics, this concept is referred to as Newton's first law of motion.

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Sir Isaac Newton's first law of motion is separated into two parts: An object will not move until a force acts upon it, and once in motion, the velocity of the object will not change until something forces it. These concepts are sometimes referred to as the Law of Inertia.

Another definition of Newton's first law of motion is that a body acted upon by no net force moves at a constant velocity with zero acceleration. The term net force refers to the total amount of force pulling down on an object. A stationary object on a floor has a gravitational force pulling downward on it, but there is also a natural force pushing up from the floor. As a result, the net force is zero, meaning the object will not move until a force acts upon it and changes its velocity.

Newton's three laws of motion were compiled in his book, "Mathematical Principles of Natural Philosophy," which was published in 1687. It was in the third edition of this work that Newton combined his laws of motion and his law of universal gravitation to explain Kepler's laws of planetary motion.

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## Related Questions

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Inertia is not a force. Scientist Isaac Newton defined it as the property of a massive body that keeps it still if it is already still, or keeps it in motion if it is already in motion. Inertia is inextricably tied to mass, although it is a distinct quantity.

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Inertia is the quality a mass, or any object, has that keeps it still, if it is not moving, or in motion, if it is in motion. The relationship between mass and inertia has much to do with the first two laws of physics by Isaac Newton, which are that an object at rest will tend to stay at rest and an object in motion will tend to stay in motion.

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Buoyancy is the tendency of an object to float in a fluid if the object is less dense than the fluid. The phenomenon was first discovered by Archimedes and is explained by the upward force a fluid exerts on an object immersed in said fluid.