TheLiteralist writes:
Braking DOES convert ALL kinetic energy to heat.
The point is that
all of the kinetic energy has to go
somewhere.
Try this experiment:
Lay an iron bar on an anvil and beat on it for a while with a hammer. What happens?
The iron bar
will heat up. The anvil
will heat up and the hammer
will heat up. The kinetic energy from your arm swinging the hammer is converted to heat. And nothing moved.
Similarly, your idea of raindrops transferring kinetic energy to the earth and "cancelling each other out", is wrong.
Take a scenario with only two raindrops on opposite sides of the earth. Their vectors "cancel out" as you say. But they can't move the earth, since they are exerting equal forces from opposite directions. So, where does their kinetic energy go?
Heat.
Taken as a statistical population, all the raindrops of your forty-day rain will "cancel each other out" as far as movement of the earth is concerned. So, where does their kinetic energy go?
Heat.
There's no escape. All that kinetic energy has to go to heat, whether it's heating up the atmosphere by friction or heating up the earth by impact.
People who think they have all the answers usually don't understand the questions.