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Feb 27 & 28

Feb 27 & 28 . In your notes…. Reflect on this poem by Francis Thompson: All things by immortal power near or far to each other hiddenly linked are. That thou cans't not stir a flower without troubling a star.

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Feb 27 & 28

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  1. Feb 27 & 28

  2. In your notes… • Reflect on this poem by Francis Thompson: All thingsby immortal powernear or farto each otherhiddenly linked are.That thou cans't not stir a flowerwithout troubling a star. • What do you think this means? Interpret the poem in your own words by writing your thoughts in your notes.

  3. Gravity… • Is difficult to measure in everyday life • Is something we take for granted • Is the one of the 4 fundamental forces : • gravity, • electro-magnetism, • strong nuclear forces (which hold the nucleus together) • weak nuclear forces (involved with radioactive decay  weak nuclear forces: are involved with carbon dating, are a source of radioactivity, etc..)

  4. Which is the WEAKEST of the 4 forces? • Strong Nuclear Force • Weak Nuclear Force • Electromagnetic Force • Gravity 10 Countdown

  5. TRUEor FALSE: The Moon has no gravity. • True • False • Not enough information to say • I’m not really sure 10 Countdown

  6. TRUEor FALSE: Planets with thin atmospheres have little gravity • True • False • Not enough information to say • I’m not really sure 10 Countdown

  7. TRUEor FALSE: Planets distant from the Sun have less gravity than Earth • True • False • Not enough information to say • I’m not really sure 10 Countdown

  8. TRUEor FALSE: Space shuttle astronauts are weightless because there is no gravity above Earth • True • False • Not enough information to say • I’m not really sure 10 Countdown

  9. Google… • PHET Gravity and orbits • Click the first link • Run the simulation and complete the Lab Activity Sheet. This is due next class for a grade – you will have about 20-30 minutes next class to finish working on this (10 pointsbased on completion) • There will also be a graded, individual, 30 point POST LAB next class to assess this lab activity.

  10. Action: Earth pulls moon. - What is the reaction? - What is stronger – action, reaction, or same? - What Law defends your answer?

  11. Action: Earth pulls moon.What is stronger – action, reaction, or same? • Action(Earth pulls moon) • Reaction (moon pulls Earth) • Same!

  12. What law defends your answer? • 1st Law • 2nd Law • 3rd Law

  13. Choose the picture you think shows the gravity forces on the Earth and the Sun.

  14. How would these gravity forces change if the Sun got more massive? • Increase • Decrease • Stay the same

  15. How would these gravity forces change if the Earth was much closer to the Sun? • Increase • Decrease • Stay the same

  16. How would these gravity forces change if the Earth got much less massive? • Increase • Decrease • Stay the same

  17. How would these gravity forces change if the Earth and Sun were moved farther apart? • Increase • Decrease • Stay the same

  18. Choose the picture of how the Earth would move if you “turned off” the gravity forces.

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