Machine Design
The coefficient of friction in belt drive depends upon

Belt velocity
Materials of belt and pulley
Material of belt
Material of pulley

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Machine Design
The elasticity is the property of a material which enables it to

Draw into wires by the application of a tensile force
Retain deformation produced under load permanently
Resists fracture due to high impact loads
Regains its original shape after deformation when the external forces are removed

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