Date: Sat, 19 Aug 2006 12:41:08 -0400 (EDT)
Subject: Planned Revisions - "Weighty Questions" (fwd)

Title: Gravity's Pull - Investigating the Effects of Gravity
Create TAK version.

Activity Extension: What are the variables that affect the gravitational
force of attraction between two objects? What are the mathematical
interrelationships among these variables?

Do This...
Visit the "Gravitational Force Calculator" ...
[cp all (or most all) calculators to single folder, with simpler URL, e.g.,
http://www.wsanford.com/~wsanford/calculators/name.html]

Think About This...
Ques. 1-3

For Further Thought...
Ques. 4-6 (as per unrevised numbering scheme)

==
Date: Sat, 19 Aug 2006 10:58:23 -0400 (EDT)
Subject: Newton's law of universal gravitation + Microgravity Calculator

http://en.wikipedia.org/wiki/Gravitation

Newton's law of universal gravitation

... Newtons law of gravitation states that: every particle in the universe
attracts every other particle with a force that is directly proportional to
the product of their masses and inversely proportional to the square of the
distance between them. If the particles have masses m1 and m2 and are
separated by a distance r (from their centers of gravity), the magnitude of
this gravitational force is:

... insert graphic showing formula, F = G x m-sub1m-sub2/r(2) ...
x.png 631 bytes 112x38x256 png
x.gif 1.3 KB " "

where:

F is the magnitude of the gravitational force between the two point masses
G is the <gravitational constant> <-- hyperlinked
m1 is the mass of the first point mass
m2 is the mass of the second point mass
r is the distance between the two point masses

--
***add hyperlink from the following resource to my "Weighty Questions"
activity***
Note: "Weighty Questions" activity says, "The [ISS] orbits Earth at an
average altitude of ~350 km." The "Microgravity Calculator" uses a value of
390,000 m (1,279,529 ft); revise "WQ" accordingly.

[begin quote, Wikipedia]
To see the change in gravity on earth based on the altitude (r in the above
equation) based on real examples, you can use the <eXtreme High Altitude
[Conditions] Calculator>:
http://bpesoft.com/s/wleizero/xhac/?M=g
[end quote]

[begin quote, "MC" Web page]
Enter altitude OR select a fun example altitude <Submit Query>
[end quote]

[See the two rows labeled as (CONDITIONS/description) "gravity": % 1G;
m/s(2)]