Periodic motion means that the motion repeats after a finite amount of time. So, if you wait for some time, the system return to the same position. The amount of time required to return to the same position is a constant.
Which of the following is not an example of periodic motion?
- A planet orbiting the Sun in a circular orbit
- The ticking of the pendulum in a grandfather clock
- A factory manufacturing a product on an assembly line
- A ball bouncing on the floor after unequal intervals of time