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									               Conceptual Physics
                       THURSDAY November 4th, 2010
    • Continue our series of Lunar discussion questions as a class
    • Discuss the Big Bang Theory and its implications
    • Watch video segments on the Big Bang (Theory of, Evidence for, and
    Replication of)
    • Demonstrate Gravity Simulator program
         • solar system & earth-moon system simulations
    • Share thoughts on gravity Discussion Prompt
    • Calculate Earth-Moon gravitational force magnitude

 http://mrlafazia.com/PHYS111/lessons/201011Fall/PHYS111_21.ppt            1/12
         Lunar Study Questions
We will now continue our look at some of the
 important questions regarding our nearest
 celestial neighbor—Luna.

Recall that these questions relate prior content
  and experiences to the Moon-Earth-Sun

      Lunar Study Questions 9-13
9) How does a partial or total eclipse of the Sun occur?
10) How does a partial or total eclipse of the Moon
11) When does a full moon occur?
12) How does the Moon’s diameter compare to the
13) Why do the Sun and Moon appear to be
   approximately the same size “in the sky” even
   though the Sun is able to encompass millions of
   Moons within itself?
    Lunar Study Questions 14-18
14) What might happen if the Earth did not rotate on
  its own axis as it revolves around the Sun?
15) Explain what happens with high and low tides.
16) Considering the Sun’s effects (about 1/3,
  gravitationally, as the Moon’s), when would you get
  the biggest difference between high and low tides?
17) Why is the Moon getting further and further away
  from the Earth (i.e., why is it “less tightly bound”)?
18) How is the Moon (theoretically) supposed to “meet
  its end” if given enough time…?
       Discussion: The Big Bang
• Discussion: “What is the Big Bang Theory and
  what does it propose”?
  – “How does this relate to the idea of Energy
  – “Is there just one version of the Big Bang Theory”?

   Video Segments: The Big Bang
• Segment 1: Theory Behind the Big Bang (3 mins)
• Segment 2: Evidence for the Big Bang (6 mins)
• Segment 3: Replicating the Big Bang (3 mins)
  – After each clip we may discuss what was presented.
     • Any questions which arose should be brought up during
       that time.

      Gravity Simulator: Part 1
Our Solar System and the importance of
 gravitational stability…

“What happens when we delete a planet?!”

              Gravity Simulator: Part 2
• Making our OWN Earth-Moon system
  – Each group must research one aspect of the Moon…
     •   Size (in kilometers) (meaning Diameter)
     •   Mass (in kilograms)
     •   Semi-Major Axis (in kilometers) (relates to distance from Earth)
     •   Eccentricity (how “elliptical” its orbit is)
     •   Inclination (where it is in relation to the Earth’s equator)

  – “What effect does the Earth have on the Moon”?
  – “What effect does the Moon have on the Earth”?
  – “How long does it take the Moon to complete its orbit”?
     • “Does this make sense”??
  – “What happens when we delete the Earth?!”
     • MAKE PREDICTION and THEN test it.
     Discussion Prompt: gravity
“It is often a misconception that other planets
   do not exhibit gravity of their own. Think
   about space exploration. How would other
   planets NOT “having” gravity make space
   travel MORE DIFFICULT”?

Think about this individually (make some notes
  for your own reference) and then we will
  share our ideas and discuss.
Calculation: Earth-Moon attraction
• Using Newton’s Law of Universal Gravitation,
  work out the gravitational force acting
  between the Earth and the Moon.
  – “Does it matter which object’s ‘Point of View’ you
     • WHY or WHY NOT?

        Recommended Reading:
• p. 105, Sections 6.1 – 6.5, 6.7 – 6.11

Note: The text does not offer much specific help on
Earth and Space topics, so we will rely mostly on outside
sources for our references for the majority of this unit.

              Looking Ahead:
• Next class we will discuss Solar Evolution and get
some more practice on the Law of Universal Gravitation.


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