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26-conservation of momentum

# 26-conservation of momentum - Physics 211 Chapter 9 Systems...

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Physics 211 3/27/09 Chapter 9 - Systems Center of Mass Momentum Collisions Conservation of Momentum

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Schedule Today - Momentum Conservation Monday - Complete Chapter 9 Tuesday - HW Due at 11:59 PM Wednesday - Examples/Exam Prep Friday - Exam III
Review Center of Mass - (CM, COM) - Point that moves as though (1) all of the system’s mass were concentrated there (2) all external forces were applied there p = m v Momentum Kinetic Energy K = 1 2 mv 2 Vector Scalar F NET = d P dt Newton’s 2nd Law - works for both single particle and system of particles Δ p = F ( t ) dt t i t f An impulse ( J ) will cause a momentum change

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Impulse Example A paratrooper whose chute fails to open lands in snow. Had he landed on the hard ground, his stopping time would be ten times shorter. Does the snow increase, decrease, leave unchanged: 1) momentum change 2) impulse 3) stopping force Δ p = J momentum change the same -> Impulse the same Δ p snow = F avg snow Δ t Δ p land = F avg land Δ t 10 Δ p snow = Δ p
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26-conservation of momentum - Physics 211 Chapter 9 Systems...

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