4 Gravity
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4 Gravity Presentation Transcript

  • 1. Gravity
  • 2.
    • LAW OF UNIVERSAL GRAVITATION
    • Universal Law of Gravitation – all objects in the universe attract each other by the force of gravity.
    • The size of the force depends on the mass of the objects and the distance between them.
  • 3.  
  • 4. With no air resistance why do the elephant and mouse fall together?
  • 5.
    • FALLING OBJECTS
      • The acceleration of a falling object is due to the force of gravity between the object and the earth.
      • Near the surface of the earth gravity is equal to
    • 9.8 m / sec 2 .
  • 6. Look at the forces
  • 7. Regardless of mass, acceleration due to gravity is always the same on Earth. 9.8 m/s 2 Every second an object falls it’s velocity increases by 9.8 m/s NO AIR RESISTANCE
  • 8.
    • AIR RESISTANCE
    • Air resistance opposes the downward motion of falling objects ( fluid friction ).
    • As an object falls, the air resistance gradually becomes equal to the pull of gravity.
    • When this occurs the forces are balanced.
    • There can be no more acceleration and the object falls at a constant velocity.
    • This is called the terminal velocity .
  • 9. As an object falls with air resistance the force of air increases as the object increases speed. WHEN BALANCED = TERMINAL VELOCITY
  • 10.  
  • 11.