Phys205A_Lecture20

Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Unformatted text preview: Chapter 8 Conservation of Energy Work – Kinetic Energy With Friction z If friction is acting in a system: z ∆ K = Σ W other forces – ƒ k d z This is a modified form of the work – kinetic energy theorem z Use this form when friction acts on an object z If friction is zero, this equation becomes the same as Conservation of Mechanical Energy In general D K = S W v f k d Including Friction, final v f k d D E int = ƒ k d z A friction force transforms kinetic energy in a system to internal energy z The increase in internal energy of the system is equal to its decrease in kinetic energy Example 1 z A 6 kg block is pulled by a constant force 12 N over a rough horizontal surface with m =0.15. Find speed after 3 m of the displacement z Conceptualize z The rough surface applies a friction force on the block z The friction force is in the direction opposite to the applied force z Apparently F exceeds static friction z Speed will increase with distance but will be lower in comparison frictionless case.frictionless case....
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Phys205A_Lecture20 - Chapter 8 Conservation of Energy Work...

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