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 The Trek BBS About planetary gravity
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 Science and Technology "Somewhere, something incredible is waiting to be known." - Carl Sagan.

September 14 2012, 07:23 PM   #16
JarodRussell

Re: About planetary gravity

 RB_Kandy wrote: I recently found out that gravity on any given planet is caused by the mass of the planet. I had always assumed that gravity on a planet was caused by the speed of rotation, orbit, proximity to the sun, and size of the sun. I began exploring why gravity didn't get stronger during its ellipse when it was closest to the sun, and less when it was far. It was googling that which lead me to realize the size of the planet was the cause of gravity. But I am wondering, does speed of orbit and rotation play any part of planetary gravity?
Just why did you think that the SUN was causing us getting pulled towards the Earth? Or that the rotation of Earth would pull us towards Earth? Have you ever been on a carousel, and where you pulled inward or outward by the rotation?

Glad you recently found out that gravity is caused by mass.

Now, orbital speed, the planet's rotational speed, the gravity of the sun, the gravity of the Moon, they all affect the gravity of the Earth.

If Earth wouldn't spin, gravitational pull would naturally be a bit stronger. The Moon's gravity pulls on Earth and anything: it causes tides (because the whole body of water is pulled towards the Moon, and the Earth rotates through that water "hill"), earthquakes, and the gravitational friction constantly reduces the Earth's rotation speed. The gravity of the sun affects us more when Earth is closer to the sun, and less when it's farer away from the sun, naturally. But it's a pretty minor difference. And yeah, even the sun causes tides, just like the Moon.

 September 14 2012, 08:55 PM #17 Trekker4747 Trekker4747     Location: Kansas City Re: About planetary gravity And anyone who's ever ridden on a merry-go-round or other spinny-type ride knows that the rotation tries to throw you OFF of it not pull you more into it. If Earth's spin were to have any real impact on us it'd be more likely to throw us into space than it would to pulls us into it. Thankfully, gravity is stronger than centripetal force. __________________ For me, and for many of us, the future is now in the past.
September 14 2012, 08:57 PM   #18
Crazy Eddie

Location: I'm in your ___, ___ing your ___
Re: About planetary gravity

 gturner wrote: Perhaps we should keep things simple. Gravity is the force that attracts liquids to your keyboard.
Which is why you should turn your chair sideways while watching internet porn.
__________________
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 September 15 2012, 03:13 AM #20 gturner Admiral   Location: Kentucky Re: About planetary gravity Wow. That sounds horrible. I had an idiot science teacher in 7th grade who insisted that atomic bombs are more powerful than hydrogen bombs because atomic bombs are fission, which throws things outwards, and hydrogen bombs are fusion, which is an implosion that sucks things inwards. I sat there thinking, "That's so stupid it's not even wrong!" Gravity is an attraction between two masses, with the formula Force = G * M1 * M2 / R^2, where M1 and M2 are the masses of the two objects, G is a constant, and R is the radius between their centers.
 September 15 2012, 03:15 AM #21 Maurice Vice Admiral     Location: Maurice in San Francisco Re: About planetary gravity I'm not going to address that litany of "they done me wrongs" and thinly veiled jabs at the left above, but it's pretty well established that there's a lot of history taught that's baldly incorrect. American history has often mythologized in public school textbooks due to the needs of the textbook industry to placate local school boards. This is why we get whitewashed versions of Helen Keller, Reconstruction, etc., and persistent myths like Betsy Ross. __________________ * * * Well, I've been to one world fair, a picnic, and a rodeo, and that's the stupidest thing I ever heard come over a set of earphones." —Major T. J. "King" Kong Last edited by Maurice; September 15 2012 at 06:43 AM.
 September 15 2012, 03:21 AM #22 JarodRussell Vice Admiral Re: About planetary gravity Oh come on, surely you were taught about basic Newtonian physics, regardless of how much your teacher rambled.
 September 15 2012, 03:53 AM #23 Christopher Writer Re: About planetary gravity Yeah, sometimes teachers are a crapshoot. I went to a high school that's considered one of the finest public schools in the United States, yet I still got a biology teacher who was a creationist and a health teacher who was a mortician. I did get some really great teachers, though, like a physics teacher who was an actual professor. __________________ Written Worlds -- Christopher L. Bennett's blog and webpage
 September 15 2012, 05:58 AM #24 sojourner Admiral     Location: I'm at WKRP Re: About planetary gravity a mortician for a Health teacher? that could have been interesting. __________________ Baby, you and me were never meant to be, just maybe think of me once in a while...
 September 15 2012, 06:03 AM #25 Christopher Writer Re: About planetary gravity ^Just try to imagine learning sex education from a sardonic, middle-aged mortician who sounds like Fat Albert's Mushmouth without the speech impediment. __________________ Written Worlds -- Christopher L. Bennett's blog and webpage
September 15 2012, 07:24 AM   #26
Tiberius
Commodore

Re: About planetary gravity

 Christopher wrote: ^Just try to imagine learning sex education from a sardonic, middle-aged mortician who sounds like Fat Albert's Mushmouth without the speech impediment.
Better than learning about sex from a middle aged person who's sworn to be celibate and gets his information from a book written by people two thousand years ago...

But let's not go down that road...
__________________

September 15 2012, 07:27 AM   #27
Tiberius
Commodore

Re: About planetary gravity

 RB_Kandy wrote: I remember he made a speech about the laws of the road, and how at 60 MPH some special inertia takes place.
Actually, it's 88mph.
__________________

September 15 2012, 07:30 AM   #28
RB_Kandy
Commander

Location: RB_Kandy
Re: About planetary gravity

 Maurice wrote: I'm not going to address that litany of "they done me wrongs" and thinly veiled jabs at the left above, but it's pretty well established that there a lot of history taught that's baldly incorrect. American history has often mythologised in public school textbooks due to the needs of the textbook industry to placate local school boards. This is why we get whitewashed versions of Helen Keller, Reconstruction, etc., and persistent myths like Betsy Ross.
Well they did do me wrong
Of course they did everyone wrong. My old high school had some pretty incredible drop out rates.

Of course it's 100% my own fault that I never to this day got my GED.

Come to think of it, I failed metal shop through lack of trying, so I guess by 9th grade I was failing my teachers as much as they were failing me.

Hmm, I was wondering why so much of school taught history is incorrect.
I mean, the first thing that springs to my mind is "damn leftist politics" (which there was a lot of, jab jab) but the reality of it is a lot of the stuff I learned that was false, had no political motivation behind it.

You say it's because the textbook industry is trying to make money? or are you saying they are trying to fill some sort of quota?

And what Betsy Ross myths are you talking about?

 JarodRussell wrote: Oh come on, surely you were taught about basic Newtonian physics, regardless of how much your teacher rambled.
Actually my 8th grade science teacher, Mr. Little, did teach us about Newtonian physics. He had this lovely demonstration, he said "You know how women love to wear lipstick to make their lips all waxy? Karen, I want you to stand up and wet your lips. Just give 'em a quick lick like this."
After she licked her lips he said "there you go folks, that's our physics lesson. Wet waxy lips. Or WW LIPS. Which stands for Wheels, Wedges, Levers, Inclines, Pulleys, Springs"

He had made the big deal of making Karen lick her lips for the spectacle so that we'd remember it, considering we were going to spend the second half of the year learning about those exact things, and about Newton's laws of motion, and building devices using those principals, and explain the motion, the cause and effect, with the laws of newtons physics.

And because I had the biggest crush on Karen, I'll never forget her wetting her waxy lips.

I only remember the name of two of my teachers. Mr. Little, because he was my favorite, and actually the teacher who got me to care about science. And Mrs. Greene, because good god that woman had legs LOL

 Christopher wrote: Yeah, sometimes teachers are a crapshoot. I went to a high school that's considered one of the finest public schools in the United States, yet I still got a biology teacher who was a creationist and a health teacher who was a mortician. I did get some really great teachers, though, like a physics teacher who was an actual professor.
A creationist biology teacher and a health teacher that was a mortician. Oh I could just see his speeches "and here are the 5 things you can do to make sure you never have to come see me at my other profession, eat right, exorcise, don't smoke..."

I just remembered another teacher I liked, how he inspired all of us, and how he was wrongfully fired. I'll put this in a spoiler tag so everyone can skip it.

I am wondering what you guys think of this solar system theory that earth is not revolving around a stationary sun, but is instead traveling in a spiral. http://www.youtube.com/watch?v=o6jBK...eature=related

 September 15 2012, 08:15 AM #29 sojourner Admiral     Location: I'm at WKRP Re: About planetary gravity Piece of advice. Youtube is NOT the place to learn new "theories". __________________ Baby, you and me were never meant to be, just maybe think of me once in a while...
 September 15 2012, 09:18 AM #30 Tiberius Commodore Re: About planetary gravity Some of the stuff on youtube is good. But that was crap. __________________

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