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Work and Energy

Work and Energy. F. . d. Work = Fd cos . Where F is the force d is the displacement  is the angle between the force and the direction. Work = Fd cos .  = ZERO in this situation!!!. F. d. Energy – What is it?. The ability to do work. Types of Energy. Kinetic

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Work and Energy

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  1. Work and Energy

  2. F  d Work = Fd cos  • Where • Fistheforce • disthedisplacement • istheanglebetweentheforce and thedirection

  3. Work = Fdcos •  = ZERO in this situation!!! F d

  4. Energy – What is it? • The ability to do work

  5. Types of Energy • Kinetic • Gravitational Potential • Elastic Potential • Heat • Light • Sound • Electrical • Chemical • Nuclear Mechanical Energy

  6. Energy - Kinetic • Kinetic Energy • This is the energy that an object possesses due to its motion • If the mass of a body is m and its speed is v then its kinetic energy is given by KE= ½ m v2

  7. Work-Energy Principle • W = ΔKE = ½ mvf2 – ½ mvi2 • The net work done on an object (by a net force) is equal to a change in kinetic energy of the object

  8. Energy - Potential • Potential Energy – the energy of an object due to its position, shape, or condition • An system acquires potential energy when work is done against another force

  9. Energy - Potential Gravitational Potential Energy • This is the energy of an object associated with its position in a gravitational field (work done against the force of gravity to put it there) GPE= mgh • m = mass of the object • h = height of object above some fixed position • g = the acceleration due to gravity

  10. Energy - Potential • Elastic Potential Energy • This is the energy that an object possesses due to its position of being stretched or deformed • FOR A SPRING (or similar)… EPE= ½ k x2 • x = amount of stretch • k = the spring constant (a characteristic of the object being stretched)

  11. The Principle of Conservation of Energy • Energy can be transformed from one form to another, but it cannot be created nor destroyed, i.e. the total energy of a system is constant • Energy is measured in joules and it is a scalar quantity

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