Question

Satellites in low orbits require moreless velocity than higher orbits

Answer 1

More or less

Answer 2

well think about your equation for circular motion:

F=mv^2/r where F is your force of gravity in this case, v is the satellites velocity, and r is the radius of orbit

The force of gravitation between any two objects is given by F=Gm1m2/r^2
In this problem, m1 m2, and G are all constants. so now you are left with an expression in two variables with some constants

constant/r^2 = m*v^2/r (m is also a constant so you can bring that to the left, and bring the r^2 to the right)

this leaves you with:

constant = v^2 * r

from this expression, you can determine that in order to increase the radius (go into higher orbit) you would have to have to decrease the velocity v.

Long story short, Satellites in low orbit have greater velocities than satellites in higher orbits

Answer 3

Imagine this...Our moon is a natural satellite. It orbits our Earth at a slow rate (28 days for one complete revolution) due to it's distance that is large from our Earth. Now consider another planet, which is closer than the moon. You can get the image how faster the new planet has to travel as it is closer than the Moon. As objects approach closer to our Earth in a sustained revolution, it's linear velocity will increase dramatically.

to keep it simple, closer the object, faster the orbit.