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Unformatted text preview: 1 Lecture 13 Collisions and Explosions Textbook Sections 7.5  7.8 PHYSICS 220 2 Overview Last Lecture Momentum p = mv Momentum is VECTOR Momentum is conserved (when F = 0, where F are all the external forces) mv initial = mv final Impulse I = F t Gives change in momentum I = p Change in momentum requires a force acting over a time or Impulse : p = F t = I Today Center of Mass Explosions 2 Overview Last Lecture Momentum p = mv Momentum is VECTOR Momentum is conserved (when F = 0, where F are all the external forces) mv initial = mv final Impulse I = F t Gives change in momentum I = p Change in momentum requires a force acting over a time or Impulse : p = F t = I Today Center of Mass Explosions Collisions 3 Center of Mass Center of Mass Example 1: L m m Example 2: L m 5m x CM = (0 + mL)/2m = L/2 x CM = (0 + 5mL)/6m = 5L/6 X=0 X=L 4 Center of Mass For symmetric objects that have uniform density the CM will simply be at the geometrical center! + CM + + + + + 5 Exercise The disk shown below (1) clearly has its CM at the center. Suppose the disk is cut in half and the pieces arranged as shown in (2): Where is the CM of (2) as compared to (1)?...
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 Spring '09
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