Assalam-o-a'laikum. Are man made satellites not in perpetual motion?

Perpetual motion is not a problem. Air molecules are also in constant motion.

A "perpetual motion machine" is a machine that delivers more useful energy than it consumes. Satellites (and air molecules) do not fall into that category. There is no way to extract energy from them on a long-term basis without adding more than that much energy into the system.

At thermal equilibrium, there is no way to extract energy from the motion of air molecules.

A satellite has kinetic energy from its velocity. But attempting to extract that energy will cause the orbit to decay. Eventually the satellite will re-enter and no longer be able to provide energy.

Most satellites do have thrusters onboard for maneuvering, but not all do. At higher altitudes, there is simply not enough drag to affect the orbit on short timescales. So they would eventually decay/reenter, but it could be on timescales of thousands of years or more for high altitude orbits.

Alechem salaam.

Remember Newton's "an object in motion tends to remain in motion."?

Perpetual motion MACHINES are only impossible because

there's no such thing as a frictionless bearing, and the idea usually

includes some scheme for extracting energy from the system without

losing the motion. (That's the impossible part.)

Actually, even with satellites, there's some small energy loss,

(through tidal friction), and the motion isn't really 'perpetual'.

If you look closely, or wait long, enough, the satellite slows and eventually falls.

(This is though to have happened to a large moon Mars once had.

Oddly enough, Earth's seas are taking rotational energy from the

Earth, and accelerating the Moon into a higher orbit, reversing the process.)

Our Universe is interestingly strange and complex, and the closer you look

the stranger and more interesting it gets.

Keep looking and thinking.