he expressed the law of gravitation when an apple fell on his head
Fail.
You have given a classically silly answer.
Back to class, get the correct answer (hint, consider the inverse squared law in your answer).
Isaac newton created the universal law of gravitation.
The universal law of gravitation is given by Issac Newton.
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There is no such law for universal gravitation. In Sir Isaac Newton', treatise, the 'Principia'. it is the 'Universal Law of Dynamics'. This law has three parts ;- A body will remain stationery or in uniform motion, unless acted upon by a force. Force is directly proportional to both 'mass' and ' acceleration'. To every force there is an equal and opposite force. Newton based his work on that of two earlier scientists; viz;- #1 Galilieo , who established the Law of of Gravity on EARTH. #2 Johannes Kepler; who established the Law of Planetary motion. Newton 'stood omn the shoulders of giants'.
The distance used in Newton's law of gravitation is the distance between the centers of mass of two objects.
newton first law of motion newton second law of motion newton third law of motion newton gravitation law of motion
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Isaac Newton discovered the universal law of gravitation in 1687.
The Law of Universal Gravitation is derived from observations by Isaac Newton, called induction.
He was in an orchard examining apples falling when he formulated the Universal Law of Gravitation.
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Newton.