PHY132_L05

# PHY132_L05 - Classical Physics II Classical Physics II...

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lassical Physics II Classical Physics II PHY132 Lecture 5 The Electric Potential Lecture 5 1 02/03/2010

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Recap: Work and Energy In PHY131 we went from the discussion of (vector) forces and Newton’s Law: Σ F i =m a , to a very useful concepts: 1 s WORK done by force F : – (SCALAR!) 0 () F Wd s F ss KINETIC energy: • POTENTIAL energy can be defined, but for ( ) 2 1 2 iF F mW K m v = ⇒= Δ = Δ ∑∑ a CONSERVATIVE forces (where the work ONLY depends on the end positions of the trajectory !): ) ( ) ( ) U x U x W x x • ENERGY conservation (if NO non-conservative forces re present): , F F f Fi F f i UU Δ =− = Lecture 5 2 are present): 02/03/2010 ;0 Ff i F EU K E E E ≡+ Δ =

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Total Work and Kinetic Energy Typically the result of the total work on a mass m is not only displacement, but often also a change in its velocity.
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## This note was uploaded on 04/14/2010 for the course PHY 132 taught by Professor Rijssenbeek during the Spring '04 term at SUNY Stony Brook.

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PHY132_L05 - Classical Physics II Classical Physics II...

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