一到英文的物理题AsasatelliteorbitsEarth,thegravitationalforceiscon-stantlypullingthesatelliteinward.Whatcountersthisforce?

Question

一到英文的物理题
As a satellite orbits Earth,the gravitational force is con-
stantly pulling the satellite inward.What counters this
force?

Answer 1

The satelite is going on a circle movement around the earth, so it needs some force to act as centripetal force. In this case, the gravitational force from the earth is acting as the cntripetal force which maintains the circle movement.