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27-collisions

# 27-collisions - Physics 211 Chapter 9 Systems Center of...

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Physics 211 3/30/09 Chapter 9 - Systems Center of Mass Momentum Conservation of Momentum Collisions

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Schedule Monday - Complete Chapter 9 Tuesday - HW Due at 11:59 PM Wednesday - Exam Preparation 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 If there are no external forces momentum is conserved d P dt = 0 P = constant

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Singing in the rain! A person stands under an umbrella during a rainstorm. Later the rain turns to hail, although the number of “drops” hitting the umbrella per time and their speed remains the same. Which case requires more force to hold the umbrella?
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27-collisions - Physics 211 Chapter 9 Systems Center of...

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