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Unformatted text preview: PHYS 211 3/6/09 Chapter 7 Kinetic Energy and Work Constant Forces Variable Force (Spring) Power Exam II Results !"!! !"$! !"%! !"&! !"! ("!! ("$! ("%! ( ) (* (+ $, *( *) %* %+ ,, &( &) )* )+ , +( +) (!* (!+ ((, ($( ($) (** (*+ (%, (,( (,) (&* (&+ (), (( () (+* (++$( Test 2 Average = 71 Q4 Excluded Score=points/40 Score Summary Kinetic Energy K = 1 2 mv 2 Work W = K = F d Work transfers energy  sign indicates direction of transfer Constant Force W = F ( r ) d r r i r f = F ( x ) dx + x i x f F ( y ) dy + y i y f F ( z ) dz z i z f W s = 1 2 k x 1 2 x 2 2 ( ) Spring Force F = k ( x x ) = k d Dropping Two balls of equal size are dropped from the same height from the roof of a building. One ball has twice the mass of the other. When the balls reach the ground, how do the kinetic energies of the two balls compare?...
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 Spring '08
 PETTIE
 Energy, Force, Kinetic Energy, Power, Work

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