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Lec 18 | 8.01 Physics I: Classical Mechanics, Fall 1999

explanation work/energy theorem
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explanation work/energy theorem

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Description: A block on an inclined plane with friction is analyzed to solve for the coefficient of static friction. The work-energy theorem is shown to provide an elegant solution to solving for the block's velocity.


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demonstration
demonstration friction
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demonstration friction

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Description: A top is spun on the desk to show that friction dissipates the top's kinetic energy into heat and the top quickly falls over. Professor Lewin then spins the same top on a small magic black box. The top does not fall over, how bizarre!


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explanation work/energy theorem
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explanation work/energy theorem

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Description: The maximum angular swing of the pendulum is calculated using the initial conditions and the conservation of mechanical energy. The work-energy theorem gives the same result.


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demonstration
demonstration friction
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demonstration friction

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Description: Fifteen minutes later the top is still spinning. How on Earth is this possible?


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explanation conservation of mechanical energy
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explanation conservation of mechanical energy

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Description: Conservation of mechanical energy is used to calculate the maximum displacement of an object attached to a spring for given initial conditions.


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problem
problem newtonian gravity
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problem newtonian gravity

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Description: The orbital speed of the Earth around the sun is calculated. The kinetic and potential energies of the Earth are reviewed. The escape velocity, to leave the solar system is discussed.


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problem
problem resistive forces
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problem resistive forces

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Description: This segment reviews concepts and measurements from lecture 12 such as the viscous and pressure drag terms, the terminal velocity, and the critical velocity.


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demonstration
demonstration friction
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demonstration friction

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Description: The top has been spinning now for over 30 minutes; what's going on?


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References:

  1. Work-Energy Theorem - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  2. Bizarre Spinning Top - Part I - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  3. Pendulum, Work and Energy - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  4. Bizarre Spinning Top - Part II - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  5. Spring, SHO and Initial Conditions - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  6. Newton's Law of Universal Gravitation - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  7. Resistive Forces, Viscous Term - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
  8. Bizarre Spinning Top - Part III - Lewin, Walter, 8.01 Physics I: Classical Mechanics, Fall 1999. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 07 Jun, 2010). Ccbyncsa
 
August 17, 2010 08:26

teste

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