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Universal Gravitation February 5th, 2009
Gravitational Force <ul><li>Mutual force of attraction between particles of matter </li></ul><ul><ul><li>Do you exert a gr...
Newton’s Law of Universal Gravitation <ul><li>Depends on the distance between two masses </li></ul><ul><ul><li>F g =G*m 1 ...
Practice! <ul><li>Find the distance between a 0.300 kg billiard ball and a 0.400 kg billiard ball if the magnitude of the ...
Homework This will be collected next class <ul><li>P. 265   </li></ul><ul><ul><li>Practice 7I </li></ul></ul><ul><ul><ul><...
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Universal Gravitation

  1. 1. Universal Gravitation February 5th, 2009
  2. 2. Gravitational Force <ul><li>Mutual force of attraction between particles of matter </li></ul><ul><ul><li>Do you exert a gravity force on the earth? </li></ul></ul><ul><li>Field force that exists between two masses regardless of: </li></ul><ul><ul><li>The medium (stuff) that separates them </li></ul></ul><ul><ul><li>Their size or composition </li></ul></ul><ul><ul><ul><li>What’s the difference between a field and a contact force? </li></ul></ul></ul>
  3. 3. Newton’s Law of Universal Gravitation <ul><li>Depends on the distance between two masses </li></ul><ul><ul><li>F g =G*m 1 m 2 /r 2 F g = force of gravity </li></ul></ul><ul><ul><li>G= constant of universal gravitation </li></ul></ul><ul><ul><li>G=6.673 x 10 -11 Nm 2 /kg 2 </li></ul></ul><ul><li>This is the stuff that keeps the planets in motion! </li></ul>
  4. 4. Practice! <ul><li>Find the distance between a 0.300 kg billiard ball and a 0.400 kg billiard ball if the magnitude of the gravitational force is 8.92 x 10 -11 N </li></ul><ul><li>Find the gravitational force exerted on the moon (m=7.36 x 10 22 kg) by Earth (m=5.98 x 10 24 kg) when the distance between them is 3.84 x 10 8 m </li></ul>
  5. 5. Homework This will be collected next class <ul><li>P. 265 </li></ul><ul><ul><li>Practice 7I </li></ul></ul><ul><ul><ul><li>#1-3 </li></ul></ul></ul><ul><li>Read p. 266-267 & Answer these questions </li></ul><ul><ul><li>What is the formula used to calculate escape velocity? </li></ul></ul><ul><ul><ul><li>Does the mass of the projectile matter? </li></ul></ul></ul><ul><ul><li>What is the escape velocity of a projectile from earth? </li></ul></ul><ul><ul><li>Does a projectile require a high or low speed to escape from a body with a low mass and large radius? </li></ul></ul><ul><ul><li>What is the Schwarzchild radius? </li></ul></ul><ul><ul><ul><li>Why can’t light escape from this point? </li></ul></ul></ul><ul><ul><li>Where is the closest black hole? </li></ul></ul><ul><li>P. 271 </li></ul><ul><ul><li>#38, 39, 40, 47 </li></ul></ul>

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