Question

How does the wind move the blade of a windmill

Answer 1

when molecules of air come in contact with blade ....it applies some force on and then it rotates

Answer 2

This is done by using a large wind turbine usually consisting of propellers; the turbine can be connected to a generator to generate electricity, or the wind used as mechanical power to perform tasks such as pumping water or grinding grain. As the wind passes the turbines it moves the blades, which spins the shaft.