Answer:
Gravity, inertia, centripetal force
Explanation:
Gravity: A space shuttle in orbit experiences gravity not just from the planet it is orbiting but from other celestial bodies too
Air resistance: There is no atmosphere in space so the shuttle experiences no air resistance
Friction: There is no atmosphere or surface that it is moving on so the shuttle experiences no friction
Inertia: Any body that is moving or stationary experiences inertia, the resistance to change in velocity whether it is moving or stationary
Centripetal force: The shuttle is in orbit, what keeps it in orbit is the centripetal force towards the center of the body it is orbiting
