# why do earth rotate?

India
September 4, 2011 2:18am CST
Hello guys. We all know that earth revolves around sun due to the gravitational force. but i don't know how does the earth rotate? is there any force acting on it or is it simply rotating by itself? please answer to my question.
1 response
@mantis36 (4237)
• Philippines
4 Sep 11
the earth rotates around the sun because the sun have a great gravity pull that act like a principles of syncrotron... although the earth has a gravity pulling effect too.... acting like two different forces attract each other, such force came from the sun and another force came from earth itself.... it is like you and your friend holding both hands together while slightly pull both of yourself.... so the body (earth) in motion remains in motion in a constant speed because there is no outside force (no other third party of force) that act upon them....
• India
4 Sep 11
no my question is why is earth rotating itself? there is no force causing it to rotate. just i want to know why do earth rotate?
@mantis36 (4237)
• Philippines
4 Sep 11
simple to answer, take a good look of example: put a ball on top of the table... try hit that ball a single punch and hit it on the either of that ball's edge... now you see? that ball spins to neutralize itself.... note: that ball spins faster but soon that ball tends to stop spinning because the ball on top of that table are affected by the earth's gravity, and since that ball it's environment is NOT COMPRESSED, therefore, the ball tends to stop spinning soon. Early Earth, are smaller than what we have now, but another earthlike planet collide to earth (at the time when the earth is hot enough) so the mass of the earth increases and due to collision between planet earth and an unknown planet, the earth tends to spin.... but due to the environment of the universe is COMPRESSED, then a reason that until now, the earth tends to spin earth spinning in a constant speed for 24 hours to complete it's 1 spin as the Newton's Law which stated that: "A body at rest tends to be at rest, while the body in motion tends to be in motion in a constant speed unless, there is no outside force (third party of force) to divert ....
• India
7 Sep 11
thanks!!!!!!!!!