Physics 1 Problem Solutions 54

Physics 1 Problem Solutions 54 - 50 Chapt 5 Newton’s Laws...

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Unformatted text preview: 50 Chapt. 5 Newton’s Laws and Dynamics I a) they cancel out in threesomes. b) they are all zero. c) we just ignore them. d) they cancel out pairwise. e) the external force cancels them out. 005 qmult 00560 1 4 5 easy deducto-memory: center of mass in Fnet=ma 18. “Let’s play Jeopardy ! For $100, the answer is: The mass-weighted average position of a system of particles: a system being any specified set of material mass elements. This position’s acceleration obeys vector F net = mvectora , where vector F net is the net force (and also the net external force) acting on the system.” What is the , Alex? a) center b) bottom end c) top end d) left end e) center of mass 005 qmult 00562 1 1 5 easy memory: net external forces and center of mass Extra keywords: anticipates later chapters, but that’s OK 19. If you know nothing about the internal forces of a body and only know the net external force that acts on the body and not where on the body the particular external forces act, then, by...
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