Lecture_11_(Student_Handoutl)

# Lecture_11_(Student_Handoutl) - PHYS 172 Modern Mechanics...

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Summer 2009 PHYS 172: Modern Mechanics Lecture 11 – The Energy Principle in Multiparticle Systems Read 5.7 – 5.16

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Energy principle (single particle system): where energy is and work is Last Time: Single Particle System set heat = 0 for now single particle system EW Q Δ= + 2 2 single particle system 22 1/ mc Em c vc γ ==

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CLICKER QUESTION #1
What’s the Sign of the Work? The moral of the story: The direction of the force by itself says NOTHING about the sign of the work (and hence the change in energy).

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The general formula for the work done by a single force is Work Done By Multiple Forces Total work done on a system (by multiple forces) during some interval is As before, you are REQUIRED TO Use the average force over the interval OR •Use an interval small enough that Fnet is roughly constant r F r F W W net object force each by G G G G Δ = Δ = = objects g interactin r F W F by system on G G G Δ =
What Does “Interval Mean” Here?

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Lecture_11_(Student_Handoutl) - PHYS 172 Modern Mechanics...

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