What prevents satellites such as the space shuttle from falling?
A) centrifugal force
B) gravity
C) the absence of air drag
D) centripetal force
E) Nothing; they are continually falling as they orbit the Earth.

Question

Quizplus · Accepted Answer

Satellites, including the space shuttle when it was operational, are indeed continually falling towards the Earth. However, because they have a horizontal velocity, they keep missing the Earth, thus staying in orbit. This state of perpetual free-fall around the Earth is what keeps them in orbit, not escaping from the pull of gravity but rather constantly falling under its influence while moving forward.

What Prevents Satellites Such as the Space Shuttle from Falling