352014 phys 2010 center of mass for sphere middle 13

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Unformatted text preview: prise, surprise !! Gravita>onal force on an object on the surface of the Earth! 3/5/2014 PHYS- 2010 10 Who does the force act on? m1 = 70 kg m2 = 70 kg r = 1 meter −7 | F | gravity = 3.3 × 10 Newtons Answer = Both – Newton’s 3rd law! Person #1 exerts a force on Person #2 Person #2 exerts a force on Person #1 3/5/2014 PHYS- 2010 11 Room Frequency BA Clicker Ques:on Yoda is standing on the surface of the planet Dagobah. Dagobah exerts a gravita>onal force FDagobah on Yoda, and Yoda exerts a gravita>onal force FYoda on Dagobah. Strong is the Force with me! Which of the following is correct: A)  FDagobah > FYoda B)  FDagobah < FYoda Newton’s Third Law! C)  FDagobah = FYoda D)  It’s not so simple, we need more informa>on. 3/5/2014 PHYS- 2010 12 Extended Objects Objects are extended in space. Newton’s Law of Universal Gravita>on is based on compu>ng the distance between two objects, but which distance? RCM In fact, every part of object #1 exerts a gravita>onal a^rac>on on every part of object #2, and vice versa. When adding all vector components, we treat the force as ac>ng between the “center of mass” of each object. 3/5/2014...
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