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Newton’s Third Law of Motion Level 1 Physics

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N.T.L Whenever one body exerts a force on a second body, the second body exerts an oppositely directed force of equal magnitude on the first body The main focus is on “action-reaction” pairs They never cancel out

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N.T.L. To help understand the third law better, let us look at the second law A big yellow bus collides with a mosquito. The result is as follows F b = m b a b F m = m m a m F b = F m BUS MOSQUITO mbabmbab mmammmam = There is a balance between the mass and acceleration. One object usually has a LARGE MASS and a SMALL ACCELERATION, while the other has a SMALL MASS (comparatively) and a LARGE ACCELERATION.

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Examples of N.T.L.

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Newton’s Law of Gravitation Anything that has mass, has a gravitational pull towards it. Therefore, the reason why you fall is because the Earth is pulling you towards its center (you are also pulling on the Earth). Every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses.

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N.L.o.G The further you are from the center of the Earth, the Force Due to Gravity will decrease rapidly. The Force of Gravity is inversely proportional to the square of the distance between them (their centers)

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N.L.o.G – Combination

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Gravity How to determine the value of gravity. Your weight is a force due to gravity, therefore set mg equal to F g m 1 = Mass of Earth (M e ), m 2 = your mass

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Example The mass of the Hubble Space Telescope is 11 600 kg. Determine the weight of the telescope (a) when it was resting on the earth and (b) as it is in its orbit 598 km above the earth’s surface. Calculate using above equation and your answer should be

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Last Thought

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