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L16_phys131_24oct07

# L16_phys131_24oct07 - N φ θ L mg Add friction to previous...

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Summary for Lecture 16 on October 24, 2007 Energy has many forms, but the total energy never changes (is conserved). Define translational kinetic energy: Define work: Define work if The vector force and distance are constant: Connect kinetic energy and work: W K K cos Fd d F W s d F W ) joules ( mv 2 1 K i f d d 2 f i + = φ = = = = °

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Starting at rest, what is the block’s speed after sliding down frictionless 4 meter high slide 4 m 30 0 s m 85 . 8 gh 2 v mgh mv 2 1 sin h L But sin mgL cos mgL mv 2 1 W K K f 2 f 2 f i f = = = θ = θ = φ

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Unformatted text preview: N φ θ L mg Add friction to previous problem, μ =0.25 4 m 30 N φ θ L mg F f ( 29 s m 67 . 6 tan 1 gh 2 v tan 1 mgh tan mgh mgh mv 2 1 sin h L But L cos mg sin mgL NL cos mgL mv 2 1 W K K f 2 f 2 f NET i f = θ μ-= θ μ-= θ μ-= θ = θ μ-θ = μ-φ = + = Springs 2 s kx 2 1 U kx F =-= Power watt 1 ond sec joule 1 dt dW P = =...
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L16_phys131_24oct07 - N φ θ L mg Add friction to previous...

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