1006_chap15

1006_chap15 - ME240 Agendatoday WorkandKineticEnergy(15.1)

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d td ME 240 Agenda today Work and Kinetic Energy (15.1) Work done by Particular Forces (15.2) HW: 15.25, 15.46 Supplemental Problems: 15.39, 15.54
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Conceptual Question Two blocks of identical mass are released from rest on o smooth inclined planes two smooth inclined planes: Which block will have the greater velocity at point 2?
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Principle of Work and Energy ecall  1 21 22 11 12 s t U F ds mv Recall 1 s In general External work is the integral of the tangential force integrated along e path of a particle (or oM the path of a particle (or CoM) owever in special cases, external However in special cases, external work is independent of the path Constant force fields(e.g. gravity) Displacement dependent forces (e.g. elastic springs)
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Work due to Gravity work of a constant force: c o s ) F 12 cos yy 12 (c UF  Fm g ) m g y y work of gravity: 12 1 2 12 often written as () ( ) Um g y m g h 3 14
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o blocks each of mass m=30kg are released with a Problem 15.33/15.34
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1006_chap15 - ME240 Agendatoday WorkandKineticEnergy(15.1)

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