Chapter06 - Chapter6:Workand KineticEnergy 1.Work Work The...

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Chapter 6 : Work and  Kinetic Energy
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1. Work  Work The product of displacement and the force in the direction of displacement Unit : J (joule)=N m scalar quantity W = Constant Force, Straight line displacement
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Positive work, Negative work, Zero work
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Example 6.2) Work done by several forces
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Work done on an object can change its motion and energy.
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2. Kinetic Energy and Work-Energy  Theorem Kinetic energy : Energy of motion Work-energy theorem Work done by the net force on a particle equals the change in the particle’s kinetic energy 2 1 2 K mv = Definition of kinetic energy 2 1 tot W K K K = - = ∆
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Example 6.4) Using work-energy theorem to calculate speed. The initial speed v i is 2.0 m/s. What is the speed of the sled after it moves 20 m?
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Problem 6.22) A mass of 4.30 kg is initially at rest on horizontal floor. It is pushed in a straight line for 1.20 m by a trained dog who exerts a horizontal force with magnitude 36.0 N. Find the speed
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This note was uploaded on 10/04/2011 for the course PHYS 2305 taught by Professor Tschang during the Spring '08 term at Virginia Tech.

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Chapter06 - Chapter6:Workand KineticEnergy 1.Work Work The...

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