Will force of friction come into play when a riandrop rolls down a glass window plan?

 

 Will force of friction come into play when a riandrop rolls down a glass window plan?

rain drop on glass rolls down side due to gravity

Ans. Yes, there will be friction a rain drop and glass window plane. But as the window surface  is smooth the frictional force is not so strong to hold the rain drop on window surface and thus rain drop rolls down.

on the rain drop works gravitational force. so rain drop rolls down side not to up side 

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