Lecture_11_(Student_Handoutl)

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

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Summer 2009 PHYS 172: Modern Mechanics Lecture 11 – The Energy Principle in Multiparticle Systems Read 5.7 – 5.16
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
READING QUIZ #1 & 2
Background image of page 2
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 ==
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
CLICKER QUESTION #1
Background image of page 4
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).
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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 =
Background image of page 6
What Does “Interval Mean” Here?
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 22

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

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online