# lecture11 - Exam II Today's lecture will cover Textbook...

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Physics 101: Lecture 9, Pg 1 Today’s lecture will cover Textbook Sections 7.1-7.5 Exam II

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Physics 101: Lecture 9, Pg 2 Exam tonight EX for lectures and checkpoint Exam solutions
Physics 101: Lecture 9, Pg 3 Impulse I = F Δ t » Gives change in momentum I = Δ p Momentum p = mv »Momentum is VECTOR

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Physics 101: Lecture 9, Pg 4 Earlier: Work-Energy Σ F = m a multiply both sides by d Σ F d= m a d (note a d = ½ Δ v 2 ) Σ F d= ½ m Δ v 2 Σ W = Δ KE Define Work and Kinetic Energy This Time: Impulse-Momentum Σ F = m a multiply both sides by Δ t Σ F Δ t= m a Δ t (note a Δ t = Δ v) Σ F Δ t= m Δ v Σ I = Δ p Define Impulse and Momentum demo
A magician yanks a tablecloth out from under some dishes. Miraculously, the dishes remain on the table where they were. Briefly explain why the dishes were not given much impulse by the tablecloth. Impulse is force multiplied by time, so the dishes were not given much impulse since the time was so small. Uh. ..magic. DUH. Good thing we know that physics is all gibberish and the real answer to these questions is magic. The cloth must be silky smooth. the magician is not as 'magical' as he seems-- like the members

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lecture11 - Exam II Today's lecture will cover Textbook...

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