Just like, me I am sure you have wondered how satellites are able to stay the earth’s orbit and don’t just fall from the sky. It turns out that satellite orbits Earth when its speed is balanced by the pull of Earth's gravity. To understand this concept better, you need to understand the two big factors here: Its velocity and the gravitational pull. The orbit of the Earth is not a perfect circle but elliptical (it is slightly oval in shape). For an object to stay around the orbit of the Earth, it must have enough speed to retrace its path. In the case of gravitational pull, all objects possess a gravitational field, but it is most significant and felt in large objects.
A satellite that is orbiting closer to the Earth will require more velocity to resist the stronger gravitational pull. The greater the altitude, the less velocity is needed to maintain the orbit. In summary, the higher the orbit, the less velocity required, and the nearer the orbit, the faster it has to move to ensure that it does not fall.