a similar ir-regular dance can be observed from movement of small particles of smoke in atmosphere. An example like brownian motion can b observed in daily life when beam of light enters in a dark...
If tiny particles like pollen are added to clear water and observed through a micrscope they will be seen to move about randomly. This was an early clue to the fact that matter is made of individual...
One example of motion is a ball rolling down a hill. During such motion, the ball's kinetic energy is increasing and its potential energy is decreasing.