From where does earth get energy for rotation?

[joyever]

from where does Earth get energy for rotation?as its rotating means its doing some motion to work again sun's gravity soo from where does Earth gets this energy?

 

[russ_watters]

No, the Earth is not doing work against the sun, so no input is required.

 

[joyever]

but anyhow how Earth gets energy for rotation?

 

[russ_watters]

Like I said, no energy input is required. That is due to Newton's first law and conservation of energy.

 

[mp3car]

google... "why do planets rotate"

And once they "start" they don't need energy, as Russ explained.

 

[Lsos]

Once something is rotating, it doesn't need energy to keep on rotating. In fact, it needs energy to STOP it from rotating.