Just eith help of fallling apple. He asked himself while sitting under a apple tree when an apple why it falls downwards not upwards he then lead to study over years and conculed that there is a force which lead to this and he put forward 3 laws. 
Newton was an average child, he used to bunk classes. one day while sitting under a tree he noticed that an apple was falling from a tree nearby He also noticed that the apple was falling downwards and got into confusion why didn't the apple move upward he further researched about this phenomenon and concluded with 3 laws He termed the process GRAVITY. But just think if instead of that apple the would have fallen over him then maybe we would not be studying physics
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