2006-10-21 19:45:23 · 9 answers · asked by cool_yada_yada1 2 in Science & Mathematics ➔ Astronomy & Space
The earth is rotating due to inertia, it is still going on with the initial spin at the time it became a planet. Interestingly the gravitational force of the moon on sea and the effect of tidal movement causes the earth to slow down.
2006-10-21 23:50:40 · answer #1 · answered by ash v 3 · 1⤊ 0⤋
Actually there is no energy with the earth to revolve. It is the initial velocity of the Earth due to which it moves. It is same as if we throw a ball, but the only difference is that there is a frictional force acting on the ball, whereas in the space there is no such force
2006-10-22 03:26:41 · answer #2 · answered by § mǎddy § 2 · 2⤊ 0⤋
I agree with arbiter, but he fails to go into more sophisticated details. Do you know what inertia is? Inertia: The property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force. Earth is in motion and there is no friction so earth needs no energy to keep moving. Just like if you roll a ball, the external force causing it to stop is friction, if there is no friction on the ground the ball will not stop moving, that is unless another force acts upon it, such as a wall or your hand even. Get it?
2006-10-22 03:26:25 · answer #3 · answered by Anonymous · 1⤊ 0⤋
All these heavenly bodies has their own moment of inertia. When you play with the toy it revolves for some seconds on ground and minutes also on glass because of less frictional force. In space there is no other obstruction than the effective gravitational attraction from space. Therefore these planets and stars revolve continuously.
2006-10-22 04:50:38 · answer #4 · answered by dbgyog 7 · 1⤊ 0⤋
It always has been....it formed from a revolving clump of gas and dust. All initial kinetic energy in the universe came from...you guessed it, the "Big Bang".
The Earth doesn't slow to a compete stop because there is nothing to stop it.
2006-10-22 19:58:38 · answer #5 · answered by minuteblue 6 · 1⤊ 0⤋
Its balance between Sun's gravity pulling on Earth and Earth's momentum(it wanting go straight) moving through space. All energy including motion originated from big bang.
2006-10-22 05:00:46 · answer #6 · answered by Anonymous · 1⤊ 0⤋
no energy required for revolving earth, energy required only for starting in space because there is a no forceses which appose its
2006-10-22 03:27:23 · answer #7 · answered by vijay4118 2 · 1⤊ 0⤋
In absolute terms, energy -- an expression of Light and Sound -- derives in perpetuity from Existence Itself.
2006-10-22 13:16:57 · answer #8 · answered by ? 6 · 0⤊ 1⤋
see: http://en.wikipedia.org/wiki/Newtons_Laws_of_Motion
The drag forces on the Earth are relatively minimal, so once the Earth is spinning, it'll stay spinning for billions of years
2006-10-22 02:53:51 · answer #9 · answered by arbiter007 6 · 0⤊ 1⤋