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Feb 27 & 28 - PowerPoint PPT Presentation


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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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in your notes
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.
slide3

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..)
which is the weakest of the 4 forces
Which is the WEAKEST of the 4 forces?
  • Strong Nuclear Force
  • Weak Nuclear Force
  • Electromagnetic Force
  • Gravity

10

Countdown

true or false the moon has no gravity
TRUEor FALSE: The Moon has no gravity.
  • True
  • False
  • Not enough information to say
  • I’m not really sure

10

Countdown

true or false p lanets with thin atmospheres have little gravity
TRUEor FALSE: Planets with thin atmospheres have little gravity
  • True
  • False
  • Not enough information to say
  • I’m not really sure

10

Countdown

true or false p lanets distant from the sun have less gravity than earth
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

true or false space shuttle astronauts are weightless because there is no gravity above earth
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

google
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.
slide10

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

action earth pulls moon what is stronger action reaction or same
Action: Earth pulls moon.What is stronger – action, reaction, or same?
  • Action(Earth pulls moon)
  • Reaction (moon pulls Earth)
  • Same!
what law defends your answer
What law defends your answer?
  • 1st Law
  • 2nd Law
  • 3rd Law
how would these gravity forces change if the sun got more massive
How would these gravity forces change if the Sun got more massive?
  • Increase
  • Decrease
  • Stay the same
how would these gravity forces change if the earth was much closer to the sun
How would these gravity forces change if the Earth was much closer to the Sun?
  • Increase
  • Decrease
  • Stay the same
how would these gravity forces change if the earth got much less massive
How would these gravity forces change if the Earth got much less massive?
  • Increase
  • Decrease
  • Stay the same
how would these gravity forces change if the earth and sun were moved farther apart
How would these gravity forces change if the Earth and Sun were moved farther apart?
  • Increase
  • Decrease
  • Stay the same
choose the picture of how the earth would move if you turned off the gravity forces
Choose the picture of how the Earth would move if you “turned off” the gravity forces.