Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley decreases
The power transmitted will increase
The coefficient of friction between the belt and pulley increases
The power transmitted will decrease

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Machine Design
The creep in the belt is due to

Unequal extensions in the belt due to tight and slack side tensions
Effect of temperature on belt
Material of belt
Stresses beyond elastic limit of belt material

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