20-kinetic energy and work 3

# 20-kinetic energy and work 3 - PHYS 211 Chapter 7 Kinetic...

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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 = Δ 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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20-kinetic energy and work 3 - PHYS 211 Chapter 7 Kinetic...

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