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There is Newton's definition.....
however nothing in the Universe is stationary... all is moving so bring it back to local bodies at rest stay at rest .... or motion, stay moving... unless.. then there is Inertia - Wikipedia, the free encyclopedia Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion. |
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a little history
Newton's conception of inertia stood in direct opposition to more popular conceptions about motion. The dominant thought prior to Newton's day was that it was the natural tendency of objects to come to a rest position. Moving objects, so it was believed, would eventually stop moving; a force was necessary to keep an object moving. All objects resist changes in their state of motion. All objects have this tendency - they have inertia. But do some objects have more of a tendency to resist changes than others? Absolutely yes! The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion. http://www.physicsclassroom.com/clas...laws/u2l1b.cfm |
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Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion. Pretty much as we learned it in high school 50 years ago, except it was split into inertia for things at rest and momentum for things on the move.
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