Chapter 12.1

# Chapter 12.1 - PH 2223-03 Physics II Dr David L Monts 223...

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5/12/09 PH 2223-03 Physics II Dr. David L. Monts 223 Hilbun, 325-2931 Tu/Th 1-2:30 p.m. (office hours) Text : University Physics , 12th Ed. with MasteringPhysics Course ID: MSUMONTSPH2223F08 http://www.masteringphysics.com/

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5/12/09 Chapter 12 Gravitation
5/12/09 Newton’s Law of Gravitation Every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of the masses of the particles and inversely proportional to the square of the distance between them.” Fg= gravitational force (N) m1 = mass of object # 1 (kg) m2 = mass of object # 2 (kg) r = distance between #1 and # 2 (m) G = (universal) gravitational constant

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5/12/09 Newton’s Law of Gravitation Gravitation is action-at-a-distance force . Objects do NOT need to touch. Gravitational interaction is always attractive ( F is negative, which indicates attraction). Gravitational interaction is pairwise. If more than 2 objects, then there is contribution to total Fg from each pair of objects.
5/12/09 Newton’s Law of Gravitation Magnitude of force on mass 1 due to mass 2 EQUALS magnitude of force on mass 2 due to mass 1 even if masses are different . Inverse-square law F ~ 1/(distance2) f(x) 0 as x →∞ 0 2 4 6 8 10 12 x f(x) Obj10

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5/12/09 The mass of the Moon is 1/81 of the mass of the Earth. Compared to the gravitational force that the Earth exerts on the Moon, the gravitational force that the Moon exerts on the
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Chapter 12.1 - PH 2223-03 Physics II Dr David L Monts 223...

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