Question

What is circular motion?

Answer 1

When an object moves along the circumference of a circle, its motion is called circular motion. For example, the motion of an artificial satellite orbiting the Earth at a constant height, the motion of a stone which is tied to a string and is being swung in circles, etc.

Since the object's velocity is constantly changing direction, the moving object is undergoing acceleration by a centripetal force towards the center of rotation. Without this acceleration, the object would move in a straight line, according to Newton's laws of motion.