- #1
Kacepunk
- 2
- 0
I have a pet idiot, you know the type. "Perpetual motion is the future, we don't understand everything!"
Well we've been discussing gravity, (and magnets, oh how he goes on about magnets).
He doesn't seem to be able to see the difference between force and energy.
I've finally gotten him to understand that an apple dropping from 1 meter and accelerating is not the creation of energy as energy had to be put into get the apple to the height in the first place.
What I can't explain to him is the following:
A rock is traveling through space heading towards the planet Earth. Its traveling slowly relative to the earth, only about 50kph. As it's heading towards the earth, then eventually it encounters the Earth's gravity. It accelerates towards the Earth and eventually impacts.
When it impacts it's going much faster than 50kph. Does that additional velocity mean more energy, and if so where did it come from.
Please don't let my idiot carry on like this. He's looking so smug right now, because I don't know the answer.
Well we've been discussing gravity, (and magnets, oh how he goes on about magnets).
He doesn't seem to be able to see the difference between force and energy.
I've finally gotten him to understand that an apple dropping from 1 meter and accelerating is not the creation of energy as energy had to be put into get the apple to the height in the first place.
What I can't explain to him is the following:
A rock is traveling through space heading towards the planet Earth. Its traveling slowly relative to the earth, only about 50kph. As it's heading towards the earth, then eventually it encounters the Earth's gravity. It accelerates towards the Earth and eventually impacts.
When it impacts it's going much faster than 50kph. Does that additional velocity mean more energy, and if so where did it come from.
Please don't let my idiot carry on like this. He's looking so smug right now, because I don't know the answer.