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Chapter06

# Chapter06 - Example 5.24 A passenger on a carnival Ferris...

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Example 5.24) A passenger on a carnival Ferris wheel moves in a vertical circle of radius R with constant speed. The seat remains upright during the motion. Find expressions for the force the seat exerts on the passenger at the top and the bottom.

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Chapter 6 : Work and  Kinetic Energy
1. Work  Work The product of displacement and the force in the direction of displacement Unit : J (joule)=N m scalar quantity cos W F s Fs φ = = r r Constant Force, Straight line displacement

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Example 6.1) ˆˆ (160 ) (40 ) F N i N j = - r ˆˆ (14 ) (11 ) s m i m j = + r How much work is done?
Positive work, Negative work, Zero work

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Example 6.2) Work done by several forces
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 = - = ∆
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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