Wear
![Rear sprocket for a bicycle where the left is unused and the right has obvious wear from clockwise rotation.](/Images/godic/202412/18/Kædetandhjul5749.jpg")
![](/Images/godic/202412/18/Adhesive_wear_on_52100_steel_sample5749.jpg")
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Wear is related to interactions between surfaces and specifically the removal and deformation of material on a surface as a result of mechanical action of the opposite surface.
In materials science, wear is erosion or sideways displacement of material from its "derivative" and original position on a solid surface performed by the action of another surface.