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Phys 110 final review

# Phys 110 final review - Phys 110 Final Exam Review Lecture...

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Phys 110 Final Exam Review Lecture 24 Mechanical Energy o K i + U gi + U si = K f + U gf + U sf (K + U g + U s ) = E mech K = ½mv 2 U g = mgy or mgh U s = ½k∆s 2 o If friction, drag, and other dissipative forces are negligible, mechanical energy is conserved o Momentum conservation = most useful for collisions, especially inelastic collisions Energy diagrams o Energy bar charts: shows energy transformations and transfers E T = total mechanical energy = K + U As object changes positions, this graph shows how potential energy transforms into kinetic energy or vice versa In the beginning with no energy = no potential energy At final energy level = no kinetic energy Work (Basic idea) o transfer of energy into/out-of a system o Positive net work = K increase W net > 0 ∆K > 0 When force has component parallel (indirection of) motion o Negative net work = K decrease W net < 0 ∆K < 0 When force has component anti-parallel (opposite direction of) motion

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Phys 110 final review - Phys 110 Final Exam Review Lecture...

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