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Transcript

  • 1. S: Gravity and Acceleration
  • 2. Gravity April 8, 2008
  • 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 and Newton 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 .
    • This acceleration 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.