PHYS171_f11_lecture_29

PHYS171_f11_lecture_29 - PHYS171 Prof. Arthur La Porta...

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PHYS171 Prof. Arthur La Porta alaporta@umd.edu Rm 1111, IPST building (building #085) Photo was taken… N ew York S an F ran c isc o Barc elon a Ma n chester D ist ric t f Co . rth C ro li nta e P ra gu B r m rh av en 39% 9% 4% 13% 4% 9% 9% 0% 13% 1. New York 2. San Francisco 3. Barcelona 4. Manchester 5. District of Columbia 6. North Carolina 7. Santa Fe 8. Prague 9. Bremerhaven
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When is energy conserved? Earth KE PE The “system” External source of energy (Friction, external power source, interaction with something outside the system, will ruin energy conservation) Chapter 7 Gravitational Force When we reverse the path, force remains in the same direction. Therefore F d s is positive for lifting, negative for descending. Returning to the original position causes cancelation of work done. Conservative Same argument applies to a spring. d
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This note was uploaded on 12/29/2011 for the course PHYSICS 171 taught by Professor La porta during the Fall '11 term at Maryland.

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PHYS171_f11_lecture_29 - PHYS171 Prof. Arthur La Porta...

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