Lecture11_tentative

Lecture11_tentative - PHYSICS 220 Lecture 12 Momentum and...

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Lecture 11 Purdue University, Physics 220 1 Lecture 12 Momentum and Impulse PHYSICS 220
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Lecture 11 Purdue University, Physics 220 2 We have learned: Work-Energy Theorem F = m a multiply both sides by x F x = m a x (note: a x = ½ v 2 ) F x = ½ m v 2 W = K Defines Work and Kinetic Energy We will learn: Impulse-Momentum Theorem F = m a multiply both sides by t F t= m a t (note: a t = v) F t= m v I = p Defines Impulse and Momentum Outline
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Lecture 11 Purdue University, Physics 220 3 Impulse and Momentum Define Momentum Momentum is a VECTOR Define Impulse Change in momentum requires Force acting over a period of time or Impulse p = F t or I = p Impulse: F t Vector Momentum transfer Work: F r r Scalar Energy transfer r p = m r v
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Lecture 11 Purdue University, Physics 220 4 1-D F vs t Plot Impulse is simply the area under the F (t) curve!
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Lecture 11 Purdue University, Physics 220 5 For collection of objects – p total = Σ p Internal forces: forces between objects in system External forces: all other forces Σ F ext = 0 total momentum conserved ( p tot = 0) Impulse and Momentum For single object … F = 0 momentum conserved ( p = 0 ) I F t = p f - p i = p impulse-momentum theorem
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Lecture11_tentative - PHYSICS 220 Lecture 12 Momentum and...

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