Raindrops Sliding Down Car Window: Speed?

[daniel_i_l]

I was in a car on a rainy day and saw that the drops on the window were sliding down the window at about 45 deg. , I guess that that means that the force of the wind on the raindrops is about equal to the gravitational force but is that enough to calculate the speed of the car?

 

[russ_watters]

Unfortunately, no: you need to know the force holding the drops to the window.

 

[DaveC426913]

Unfortunately, no: you need to know the force holding the drops to the window.

Yes. That would affect friction. Friction alters wind drag but not gravity. Same with size/shape of raindrops. Will affect wind drag, but not gravity.