When the satellite move in space. Why it continuous with constant velocity?
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Question

random231 · Answer

as there is no air resistance and friction in space a satellite is in the earths orbit so a satellite is in constant velocity...

anonymous · Answer

can u explain in more detail please @random231

random231 · Answer

well ill tell u how an satellite works
when it reaches space it is put into the orbit in a specific velocity..
this velocity has such an value that the gravitational pull by the earth on the satellite is balanced by the centrifugal force....

mrnood · Answer

There is no such thing as centrifugal force.

The centripetal force (due to gravity) acts to attract the satellite towards earth
If the orbital speed of the satellite is sufficient then the path it takes as it 'falls' is an elliptical orbit.
If the speed is too high - then the size of the orbit will increase, if the speed is too low then the orbit will lower (and eventually will decay -i.e the satellite will re-enter the atmosphere).

HOWEVER - NOTE:
I used the word orbital SPEED.
This remains constant, because there is no force acting in the orbital direction and hence (since F=ma) a=0 in the orbital direction.

Your question is WRONG however. VELOCITY is a vector, and includes both speed and DIRECTION

Since the satellite is in orbit - it follows an ellipse - its DIRECTION of travel is always changing (due to the centripetal force) and hence its VELOCITY is not constant, even though its speed is.

anonymous · Answer

Orbital speed only remains constant in a circular orbit. In any other orbit, the orbiting body is fastest at periapsis (the point closest to the object being orbited) and slowest at apoapsis (the point furthest away).

mrnood · Answer

Yes, sorry I had assumed a circular - even though I stated ellipse. @sheelo_mughal If you are interested - try this http://en.wikipedia.org/wiki/Orbit.

anonymous · Answer

Yes the part of the centripetal force is correct and moreover the reason for constant velocity should be the vacuum.Because of this no other forces can effect the rotation.