The force of gravity on a satellite in circular orbit doesn't change its speed because the force is
A)small compared to other forces on it.
B)canceled by centrifugal force.
C)perpendicular to its direction of motion.
D)very weak due to altitude.

Question

Quizplus · Accepted Answer

The force of gravity acts as the centripetal force that keeps the satellite in orbit, and since it is perpendicular to the direction of motion, it changes the direction of the satellite without changing its speed.

The Force of Gravity on a Satellite in Circular Orbit