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Sailing physics pow pt 2012 edited

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Forces and motion
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Sailing physics pow pt 2012 edited

  1. 1. Sailing Conceptual Physics annie cloutier 2012 copyright Wind Power is the Force Nweton’s Second Law F = m a Newton’s Third Law Action ~ Reaction Bernoulli’s Principle
  2. 2. http://science.kqed.org/quest/video/the-physics-of-sailing/  Position  Is defined in relation to a reference point  Velocity is described by  Velocity direction and speed of an object  ∆ delta means change  Change in velocity is due to changes in speed, direction or both
  3. 3. An original idea…
  4. 4. Understanding Motion  Speed  How fast an object is moving calculate by dividing the distance covered by time  Instantaneous speed  The speed at any instant  Average speed is the total  Average speed distance covered divided by the time  Total distance  Is the average speed times the travel time
  5. 5. NEWTON’S THIRD LAW Action - Reaction For every action there is an equal and opposite reaction  When an object is subjected to multiple forces at once, the result is the cumulative effect of all the forces  When forces on an object are balanced, the object will change its velocity  When forces are not balanced, no acceleration occurs  When a body A exerts a force on a body B, B exerts an equal and opposite force on A
  6. 6. Newton’s Third Law Inversely proportional  cannonball F/m =a  Cannon F /m=a
  7. 7. Velocity and Acceleration  Velocity  Acceleration  Is speed in a given  Is the rate at which the direction velocity is changing  Speed is a description  Acceleration can apply of how fast an object is to decreases as well as moving increases in speed  Velocity is how fast  Deceleration is the and in what direction it decreasing of speed moves (slam on your brakes)
  8. 8. Conservation of Energy  An unbalances force on an object produces a change in momentum  States that the energy can not be created or destroyed  Energy can be transferred from one form into another, but the total amount of energy never changes.
  9. 9. Bernoulli’s Principle
  10. 10. Pressure, push or pull is FORCE
  11. 11. Henri Coanda Romanian Jet Design scientist 1886-1972 and Sir Frank Whittle British scientist http://www.youtube.com/watch?v=EYuNKarb8oY
  12. 12. http://web.mit.edu/2.972/www/reports/sail_boat/sail_boat.html  But you can never sail directly into the wind
  13. 13. Activity : Bernoulli’s Principle  5 cm wide x 28 cm long strip of paper  Blow across the top of the paper strip  Notice the position of the end of the paper.
  14. 14. The end

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