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## Inertia
## Physics definitionIn physics, all matter has inertia. An object with inertia will not accelerate without a certain type of impetus, called a force. ## Classical backgroundThe conservation of energy in Newton's laws of motion leads to the conservation of momentum. Therefore :
## Relation to RelativityWith relativity, acceleration is relative to an inertial frame. Inertial mass is a measure of inertial frame-independent inertia, and momentum is a measure of inertial frame-relative inertia. | |||||||

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