Question

Rain drops hitting the side windows of a car in motion often leave diagonal streaks.why?​

Answer 1

Answer:

Because the air flow past the window drags the drops horizontally across the glass while at the same time gravity is making the drops run vertically down the glass. The net result is that the drops are moving across the glass in two directions at the time giving you the overall diagonal movement.

Answer 2

Answer:

Because the air flow past the window drags the drops horizontally across the glass while at the same time gravity is making the drops run vertically down the glass. The net result is that the drops are moving across the glass in two directions at the time giving you the overall diagonal movement