gravity
Its a centripetal force, whose origin/source is gravitation.
earth plates can and do collide, even though the earth rotates around the sun
Yes the tilt of the axial on the earth points the earth at the sun at different times when it's revolving around the sun giving the earth season
Nearly 6750 satellites are revolving around our earth till now(18/02/2013)
NO. The gravity of Earth, in conjunction with the inertia of the satellite, keeps the satellite revolving around Earth. However, the satellite doesn't get any nearer to the Earth. So, according to the laws of physics, no work is done. (I'm ignoring the fact that satellites sometimes lose height and need to be "boosted" a bit to maintain their orbits. Also, I'm assuming that the satellite's orbit is circular. If the orbit is elliptical the answer is more or less the same, but a bit more complicated.)
The centripetal force that keeps Earth in orbit around the Sun is caused by the gravitational attraction between Earth and the Sun. This force pulls Earth towards the Sun and prevents it from moving in a straight line, instead forcing it to travel in a curved path around the Sun.
The moon is caught in Earth's gravitational pull and the Earth spins on its axis and it is as though the moon is revolving around it
Earth revolving around the Sun. A ball attached to a string and being swung in a circular path. A car taking a curve on a road.
The earth is flat!
The mutual forces of gravitational attraction between each pair of bodies.
Around 6000
The moon revolving around the Earth - creates the tides.
Because that is what it does, it orbits the earth.
CounterClockwise
There is no such thing as the Earth revolving around the Earth. This question makes no sense what so ever...
The moon is Earth's satillite, revolving around earth eternally.
yes.