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Physics at Work

Physics at Work. What do planes and car racing have in common?. Airfoils. Bernoulli Principle: air moves faster over the top, so exerts less pressure Generates LIFT Also generates DRAG. Lift. Drag. Bernoulli principle. Faster moving air (or any fluid) exerts less pressure. More Airfoils.

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Physics at Work

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  1. Physics at Work What do planes and car racing have in common?

  2. Airfoils • Bernoulli Principle: air moves faster over the top, so exerts less pressure • Generates LIFT • Also generates DRAG Lift Drag

  3. Bernoulli principle • Faster moving air (or any fluid) exerts less pressure

  4. More Airfoils • Airfoils work by manipulating airflow, not just the Bernoulli Principle • Not all airfoils look the same • Manipulate airflow through angle of attack(answers question: how can planes fly upside down?) – further discuss angle of attack

  5. Airfoils in the sky

  6. Airfoils in the water

  7. Airfoils on the Ground

  8. Airfoils on cars • Airfoil is upside down • “Lift” is now called “Negative Lift” when the airfoil is upside down • On a car, it’s specifically called “Downforce” Drag “Negative Lift” “Downforce”

  9. Forces on cars • To discuss: propulsion comes from friction of the wheels against the ground as they spin • Also review: what keeps a car from sliding off the road during a turn? Force of Earth on Car • To discuss: what causes the drag? Not friction against the road, but at the axels, as well as air pressure Drag Propulsion Weight of Car and Passengers

  10. Forces on cars with airfoils • The addition of the “downward lift” increases the force of the earth on the car • Remember: • Ff = µ * FN Force of Earth on Car Drag from Airfoil Drag Propulsion “Downforce” • Discuss: How does this affect how fast you can go? • How does it affect the car in turns? • Make sure to discuss disadvantage of increase in drag Weight of Car and Passengers

  11. End!

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