lecture13 - Exam II Physics 101: Lecture 13, Pg 1 Newton's...

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Physics 101: Lecture 13, Pg 1 Exam II
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Physics 101: Lecture 13, Pg 2 Newton’s Laws Σ F = m a Work-Energy Σ F = m a multiply both sides by d Σ W = Δ KE Energy is “conserved” Useful when know Work done by forces Impulse-Momentum Σ F = m a multiply both sides by Δ t Σ I = Δ p Momentum is “conserved” Useful when know about EXTERNAL forces Works in each direction independently
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Physics 101: Lecture 13, Pg 3 Linear Angular Displacement x θ Velocity v ω Acceleration a α Inertia m I KE ½ m v 2 N2L F=ma Momentum p = mv Today!
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Physics 101: Lecture 13, Pg 4 Whenever we talk about rotation, it is implied that there is a rotation “axis”. This is usually called the “z” axis (we usually omit the z subscript for simplicity). Counter-clockwise (increasing θ ) is usually called positive. Clockwise (decreasing θ ) is usually called negative . [demo] z + ω
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Physics 101: Lecture 13, Pg 5 When the bucket reaches the bottom, it’s potential energy has decreased by an amount mgh. Where has this energy gone?
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lecture13 - Exam II Physics 101: Lecture 13, Pg 1 Newton's...

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