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In page Conservative force:

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Examples of non-conservative forces are friction and non-elastic material stress. Friction has the effect of transferring some of the energy from the large-scale motion of the bodies to small-scale movements in their interior, and therefore appear non-conservative on a large scale.[2] General relativity is non-conservative, as seen in the anomalous precession of Mercury's orbit.[citation needed] However, general relativity does conserve a stress–energy–momentum pseudotensor.