Which of the following concerning uniform circular motion is...

Which of the following concerning uniform circular motion is true? (A) The centrifugal force is the action-reaction pair of the centripetal force. (B) The centripetal acceleration and velocity point in the same direction. (C) The velocity of the object in motion changes, whereas the acceleration of the object is constant. (D) A satellite undergoing uniform circular motion is falling toward the center in a circular path.

Which of the following concerning uniform circular motion is true?
(A) The centrifugal force is the action-reaction pair of the centripetal force.
(B) The centripetal acceleration and velocity point in the same direction.
(C) The velocity of the object in motion changes, whereas the acceleration of the object is constant.
(D) A satellite undergoing uniform circular motion is falling toward the center in a circular path.

Key Concepts

Uniform Circular Motion

Uniform circular motion refers to the movement of an object along a circular path with a constant speed. Although the speed remains constant, the direction of the velocity vector continuously changes, which implies that the object is undergoing acceleration even when its speed is uniform.

Centripetal Force and Acceleration

Centripetal force is the net force directed toward the center of the circle that causes an object to follow a curved path. Correspondingly, centripetal acceleration is the acceleration that results from this force, and it always points inward toward the center, keeping the object in its circular path. It does not affect the speed of the object but continually changes its velocity’s direction.

Centrifugal Force

Centrifugal force is often described as the apparent force that acts outward on an object moving in a circle, but it is not a real force acting on the object in an inertial frame. Instead, it is a fictitious force experienced only in a rotating (non-inertial) frame of reference and should not be confused with the centripetal force, which is the real force causing the circular motion.

Orbital Motion

Orbital motion, such as that of a satellite around a planet, is a specific example of uniform circular motion where the gravitational force acts as the centripetal force. This means that the satellite is in a state of continuous free-fall toward the center of the planet, but due to its tangential velocity, it keeps missing the planet, resulting in a stable orbit.

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