Q. Rotation of the Earth is an example of:
Answer: Both 1 and 2
Notes: The motion which repeats itself after regular intervals of time, is called periodic motion. Rotation of the Earth is a periodic motion because the Earth takes the same time (24 hours) to rotate once on its axis. Having the shape of a circle is called circular path. When an object moves along a circular path a round path it is called circular motion. The Earth rotates around the sun in a circular path. Therefore, it is circular motion.