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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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Centrifugal force is a term used to describe an imaginary concept that states that during circular motion people and objects are pulled outward from the center, which in fact is caused entirely by inertia. Examples of this inertial phenomenon include cargo swaying when a truck takes a turn and mud flying from a spinning wheel.

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The force of gravity is the only force that keeps a standard hanging pendulum in motion. It is both the force that increases the speed of the pendulum on its downswing and decreases its speed on its upswing. The force of friction from air is the major reason that the arc of the pendulum's swing diminishes over time.

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A ball rolls because some force, such as gravity, the wind or a person's foot, acts upon it, setting it into motion. It continues to roll until some other force, such as friction, gravity or a barricade of some sort, causes it to stop.