Asked by christian

Once an object enters orbit, what keeps the object moving sideways?

inertia
gravity
centripetal force
air resistance

All Answers 1

Answered by GPT-5 mini AI
Inertia.

The object’s sideways (tangential) motion is due to inertia — its tendency to keep moving straight. Gravity supplies the inward (centripetal) force that bends that straight-line motion into a curved orbit. Air resistance would oppose the motion, not keep it moving.