Lecture13

# Lecture13 - 1 Lecture 13 Collisions and Explosions Textbook...

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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 Σ F = 0, where F are all the external forces) – Σ mv initial = Σ mv final – Impulse I = F Δ t • Gives change in momentum I = Δ p • Change in momentum requires a force acting over a time or Impulse : Δ p = F Δ t = I • Today – Center of Mass – Explosions 2 Overview • Last Lecture – Momentum p = mv • Momentum is VECTOR • Momentum is conserved (when Σ F = 0, where F are all the external forces) – Σ mv initial = Σ mv final – Impulse I = F Δ t • Gives change in momentum I = Δ p • Change in momentum requires a force acting over a time or Impulse : Δ p = F Δ 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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Lecture13 - 1 Lecture 13 Collisions and Explosions Textbook...

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