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# lec10 - Lecture10 P112 Feb11,2008 Agendafortoday...

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Lecture 10 P112 Feb 11, 2008

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Agenda for today Gravitation Newton’s law of gravitation Weight
Stretch . . . . . . and attach On a frictionless horizontal surface, a spring is stretched between two fixed walls. Why are the forces acting on the two ends of the spring due to the walls equal in magnitude ? (1) The spring's mass is uniformly distributed along its length. (2) Newton's 2nd Law (3) Newton's 3rd Law (4) The spring was stretched symmetrically. (5) Those two forces are NOT equal in magnitude.

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An example for a non-contact force:
Gravitation Newton found that a moon / g = 0.000278 and noticed that R E 2 / R 2 = 0.000273 This inspired him to propose the Universal Law of Gravitation: Universal Law of Gravitation: R R E a moon g where G = 6.67 x 10 -11 m 3 kg -1 s -2 F g = Gm 1 m 2 r 2

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Gravitation Newton published the law of gravitation along with his 3 laws of motion: Every particle attracts every other particle with a force that is proportional to the product of masses and inversely proportional to the square of the distance between them
Units Check the units- does have units of acceleration?

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