All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident: Arthur Schopenhauer -- In questions of science the authority of a thousand is not worth the humble reasoning of a single individual: Galileo Galilei -- Science is a wonderful thing if one does not have to earn one's living at it: Albert Einstein -- When you have eliminated the impossible, what ever remains, however improbable must be the truth: Sir Arthur Conan Doyle -- We all agree that your theory is crazy, but is it crazy enough? Niels Bohr -- Whenever a true theory appears, it will be its own evidence. Its test is that it will explain all phenomena: Ralph Waldo Emerson -- Since the mathematicians invaded Relativity, I do not understand it myself anymore: Albert Einstein -- I would say that the aether is a medium invented by man for the purpose of propagating his misconceptions from one place to another: W.F.G. Swann: -- Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone: Albert Einstein -- Physics is mathematical not because we know so much about the physical world, but because we know so little: Bertrand Russell -- If I could explain it to the average person, I would not have been worth the Nobel Prize: R. P. Feynman -- I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use: Galileo Galilei -- How dare we speak of the laws of chance? Is not chance the antithesis of all law?: Bertrand Russell -- Only two things are infinite, the universe and human stupidity, and I´m not sure about the former: Albert Einstein -- The glory of mathematics is that you don't have to say what you are talking about: Richard Feynman -- Anything is possible if you don´t know what you are talking about: Author Unknown -- In life, everything is relative - except Einstein´s theory: Leonid S. Sukhorukov -- Don´\'t worry about people stealing your ideas. If your ideas are any good, you´ll have to ram them down people´s throats: Howard Aiken --A day will come undoubtedly when the ether will be discarded as useless: H. Poincaré -- First they tell you you´re wrong and they can prove it; then they tell you you´re right but it isn´t important; then they tell you it´s important but they knew it all along: Charles Kettering -- It is not once nor twice but times without number that the same ideas make their appearance in the world: Aristotle -- The opposite of a true statement is a false statement. The opposite of a profound truth may well be another profound truth: Niels Bohr -- A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it: Max Planck -- Euclid taught me that without assumptions there is no proof. Therefore, in any argument, examine the assumptions: Eric Temple Bell -- Half this game is ninety percent mental: Yogi Berra

Qualitative Applications of Newton’s Third Law of Motion


sharma, ajay


Research Papers


Mechanics / Electrodynamics



Date Published:

May 1, 2021






There numerous applications of 335 years old Newton’s Third Law of Motion. But most of the applications taught in text books are qualitative in nature. These applications include rebounding of ball, recoil (backward push) of gun when bullet is fired, recoil (backward push) of gun when bullet is fired, backward motion of boat in water when person jumps from it towards shore, book remains stationary on the floor or table, forward motion of swimmer in river, rowing of boat, flying birds in atmosphere, movement of fireworks etc. The bouncy, super and sky balls, table tennis balls, ping pong balls offer highly elastic collisions. Also, the motion of rockets is explained on the basis of Newton’s third law of motion, where motion of aero plane, fighter planes (F16) etc. is not explained on the basis of Newton’s third law of motion. Can aero planes, fighter planes can reach in space (start from Kerman line) 100km above the surface of the earth. In fact, elementary principle of rocket discovered about 1000 years before and scientists improved the same step by step. However, first motor-operated airplane was discovered by Wright brothers in 1903. Now one can try to send the motor-operated plane to reach space. It may be cheaper proposition if realized in actual practice.

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