We see different types of motion in our surroundings, some are circular motion, some are periodic, some are non-periodic and others are oscillatory. In this activity we will see how we can recognize a periodic motion and a circular motion. For this we require a pendulum bob with a thread and iron stand and a wrist watch. First of all we will take the pendulum bob which is tied with a thread and suspend it on an iron stand. Now, displays the pendulum bob slightly from its original position and note the time taken to complete five oscillations. It was approximately three minutes. Bring the pendulum to rest and again displays it slightly and note the time again. We can see that the time taken in both the cases is same so this motion is sad to be a periodic motion. Now rotate this pendulum bob horizontally in a circle. This type of motion is known as circular motion. Hence a motion is sad to be periodic. If the object repeats its motion after a fixed interval of time and if a body moves in a circle then the motion is sad to be circular motion.