How does a satellite have equilibrium in the space?

Question

I mean different forces effect a satellite such as gravitational ,centrifugal and centrepetal forces.but still it revolves its orbit and has equilibrium.what kind of equilibrium it has?we have in the difinition of the equilibrium:
f(total)=0 and M(total)=0 M=momentum.
how about satellites?

Answer 1

it's centripetal force counteracts it's gravitational force from the earth or other space object. The object is constantly falling towards the planet but it's rotational energy pulls it away and as there is very little friction in space it's decay is very small but eventually most satellites will fall through the atmosphere. Ground stations perform station keeping to keep a satellite in its proper orbital position by firing rockets on the satellite.

Answer 2

A satellite is in equilibrium because the various forces are balancing each other. Therefor, an object in motion will remain in motion (and in a straight line) and an object at rest remains at rest.
When an object is in orbit, it is NOT accelerating. It is moving in a straight line, through curved space. That is why orbits don't decay or satellites fly out into space.
If it sounds confusing, it took Einstein a while to stumble onto special relativity.

Answer 3

The normal orbital mechanics are the same for all bodies. The satellite have 2 types of stability .
1 spin the satellite it becomes it's own gyro .
2 The other is gravity gradient. They use a couple of pounds on a long antenna like extension. The gravity will pull on the weight and with the long lever will hold it in the right position.

Answer 4

Satellite Orbits
http://asd-www.larc.nasa.gov/SCOOL/orbits.html

Also, satellites are NOT in space. If they were they would not work. They have to be within the protective shield of Earth.