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Gravity2008

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  • Transcript

    • 1. Notes: Gravity S: Gravity and Acceleration
    • 2. Gravity March 6, 2009
    • 3. Aristotle
      • Ancient Greece around 400 BC
      • He believed that the heavier the object, the faster it falls.
    • 4.
      • In the late 1500s, an Italian scientist named Galileo Galilei decided to prove Aristotle wrong.
      • Galileo theorized that all objects will land at the same time when they are dropped from the same height .
    • 5.  
    • 6. Elephants & feathers
      • Objects fall to the ground at the same rate because acceleration due to gravity is the same for all objects.
    • 7. What is gravity? Galileo helped us understand gravity as a force that exists between the Earth and objects. Newton showed that the same force exists between all objects. Even today, no one knows exactly why objects attract each other.
    • 8. It all starts with an apple…
      • Isaac Newton 1655
    • 9.
      • The size of the gravitational force depends on two things:
        • Mass of the objects
        • Distance between the objects
      The Law of Universal Gravitation
    • 10. What is weight?
      • Weight is a measure of the gravitational force exerted on an object.
      • Since gravity is a force and weight is a measure of gravity, weight is expressed in newtons (N).
    • 11. Gravity & Acceleration
      • The rate at which objects accelerate towards Earth is
      • 9.8 m/s 2 .
      • It is the same for all objects, regardless of their mass.
    • 12. Air Resistance
      • The amount of air resistance depends on the size and shape of an object.
      • While gravity pulls an object down, towards the Earth, the air resistance pushes an object up, or away from the Earth.
    • 13. Free Fall
      • When there is no air resistance, an object is in free fall.
      • An object is in free fall only if gravity is pulling it down and no other forces are acting on it.
    • 14.  
    • 15. Terminal Velocity
      • Force of gravity = air resistance
      • This is the highest velocity reached by a falling object thus it has 0 acceleration and falls with constant velocity.