Orbital Motion and Satellites
An object stays in orbit around a larger body when its forward motion is balanced by the pull of gravity constantly curving its path — it's continuously falling toward the body but always moving fast enough to miss it.
Circular orbits
A satellite in a circular orbit travels at a constant speed, but its velocity is always changing direction — meaning it's always accelerating, even though its speed doesn't change.
Orbital radius and speed
A satellite closer to the body it orbits needs to travel faster to maintain its orbit than one further away, which orbits more slowly.
Practice
Why does a satellite in orbit need a constant force acting on it, even though its speed stays the same?