Here's why:
* Satellites are in constant freefall: Satellites are essentially falling towards the Earth due to gravity. However, their horizontal velocity is so great that they constantly "miss" the Earth as they fall. This constant "missing" results in a circular or elliptical orbit.
* Centripetal force is necessary for circular motion: To move in a circular path, an object needs a force constantly pulling it towards the center of the circle. This force is called the centripetal force.
* Gravity acts as the centripetal force: In the case of satellites, the Earth's gravity acts as the centripetal force, constantly pulling the satellite towards the center of the Earth, keeping it in its orbit.
Important Note: While gravity is the primary force responsible for a satellite's orbit, other factors like atmospheric drag and the gravitational pull of other celestial bodies can have minor effects.
