2 air resistance
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Transcript

  • 1. Air Resistance
  • 2.
    • If only gravity is present, all objects accelerate at 9.8 m/s 2
    • Air resistance- the force air exerts on a moving object. This force acts in the opposite direction to the object’s motion. Air resistance pushes up as gravity pulls an object down.
  • 3.
    • Ex: The larger the surface area of objects, the greater amount of air resistance on it. This is why a leaf falls more slowly than an acorn.
    • Terminal Velocity- the highest velocity that will be reached by a falling object.
  • 4.
    • Ex: As an object falls through the air, air resistance gradually increases until it balances the pull of gravity. When this happens, the falling object will stop accelerating. This is the terminal velocity.
  • 5.
    • Falling Object Equation #1
    • Variable Ending Units
    • d= distance meters (m)
    • a= acceleration m/s 2
    • t= time seconds
  • 6.
    • Falling Object Equation #1
    • d = ½ at 2
  • 7.
    • Falling Object Equation #2
    • Variable Ending Units
    • v= velocity m/s
    • a= acceleration m/s 2
    • t= time seconds
  • 8.
    • Falling Objects Equation #2
    • v= a X t
    • a= v / t
    • t= v / a
    v . . . . X a t