# Physics

Discussion in 'Community' started by B2TM little bro, Aug 28, 2002.

1. ### B2TM little bro macrumors member

Joined:
Aug 23, 2002
#1
ok , this is a stupid thread, but someone at this site has the name "vector" and i learned about vectors and scalars in physics today! it was a lot of fun AND MY TEACHER IS THE COOLEST PHYSICS TEACHER EVER , at least in my little world. He treats physics like a magic class, we do all these mind boggling tricks and then relate them to physics, its great fun mate.

p.s. scalars are measurements with one "unit" like time and mass and volume.
vectors have two measurements like acceleration and directions etc. " which means they have something like degrees in the case of directions but then you can point which they go also. WOW I LOVE PHYSICS. to bad im gonna be a surgeon. shucks , maybe next lifetime.

2. ### King Cobra macrumors 603

Joined:
Mar 2, 2002
#2
Hey, man. This is a community thread. You can bull[E] all you want. And have fun while you are at it!

I learned a bit about vectors in Honors Pre-Calc earlier this year. I kind of struggled for a bit in harder vectors, most with the advanced parametric 2D curves and proportions.

I'm glad to hear you are enjoying it. What level of Physics are you in? I plan to take Honors Physics, and that should go along very nicely with my past knowledge on vectors and my upcoming Calc.

3. ### B2TM little bro thread starter macrumors member

Joined:
Aug 23, 2002
#3
well, im in physics cp, which is college prepatory, but im in calculus 2 at the local university, i doubled up in geometry and alg 2 in ninth grade, and honors physics wouldn't fit into my schedule because Latin 5 is only offered one time of the year and so that went out the window, but honors physics, at my school, is just a faster class in that you have to have your homework in earlier than the cp, and tomorrow we get our first test back , im so so so worried about those damn significant digits

4. ### peterjhill macrumors 65816

Joined:
Apr 25, 2002
Location:
Seattle, WA
#4
I used to be a Reactor Operator on a submarine in the Navy. We went through 18 months of school (6 hours of class per day five days a week, with a minimum of 2 hours of homework per night, all mandatory). We learned a lot of physics in some of the classes, and it was all very interesting. I like Pascal's law:

The pressure exerted on the surface of an enclosed fluid at rest is transmitted equally and undiminished throughout the fluid and the walls of its container.

Physics is alot of fun. If you are really interested, try to find the video series "The Mechanical Universe" You may be able to find it in a library. It was done by a Cal Tech professor, and they have alot of reinactments and cool graphics and experiments to explain things. It is really interesting. Like Cosmos is for Astronomy, this series is for mechanics.

ps If you are having trouble trying to understand a concept, feel free to email me or IM me.

5. ### job macrumors 68040

Joined:
Jan 25, 2002
Location:
in transit
#5
i might take you up on that offer sometime next year.

i'll be taking physics next semester and from what ive heard from my friends, its not the easiest of classes.

6. ### stromie952 macrumors regular

Joined:
Apr 22, 2002
Location:
Rochester, NY
#6
GO VECTORS!

As a mechanical engineering student, vectors are essentially what we do. One of my engineering friends actually said that vectors were more interesting than a girl. Occasionally, *occasionally*, we are extreme losers, but really vectors become more and more important as you get into AP/College Physics/Engineering.

WOOHOO, college starts in a week and vectors become part of everyday life once again!

Well, maybe they are not quite exciting, but if you enjoy them like some do, including me, physics can be FUN!

Joined:
Aug 23, 2002
8. ### kishba macrumors 6502a

Joined:
Dec 11, 2001
Location:
Michigan
#8
i took physics last year and am in calc this year... all i have to say is that i wish i could have taken calc & physics at the same time... knowing just some basic calc has made everything i learned in physics at least a bit easier

i found physics pretty challenging, especially the tests, but am incredibly happy that i took it

btw, my physics teacher was a perverted weirdo ... quite a fun class indeed...

i think this was my 500th post

9. ### Taft macrumors 65816

Joined:
Jan 31, 2002
Location:
Chicago
#9
Vectors are fun!!! Weeeeee!!

One of my favorite classes in college was an elective vector analysis class. I think the idea of vectors is cool because they have so many practical applications in the real world.

After taking a few years of math in college, a class dealing with vectors can shed some light on how to apply the concepts you learned over the years.For anything dealing with position, direction, and motion, vectors are on the case.

Taft

10. ### topicolo macrumors 68000

Joined:
Jun 4, 2002
Location:
Ottawa, ON
#10
Don't forget that a vector is also an organism that transmits disease causing micro-organisms to another organism and it is also a pathway for inserting foreign DNA into the genome of a host cell.

A little taste of bio in an otherwise dull and physics-filled world.

11. ### topicolo macrumors 68000

Joined:
Jun 4, 2002
Location:
Ottawa, ON
#11
Wait until you get to the multiplication of 3D vectors. Getting cross and dot products becomes really fun, but only after you get through the gruelling proofs and after you understand what's really happening in the 3D space.

12. ### King Cobra macrumors 603

Joined:
Mar 2, 2002
#12
>(little bro) im so so so worried about those damn significant digits

Man, that's the easiest part for me. As long as you know what you are doing with your numbers, you automatically pass about 10 percent of a physics test.

>(topicolo) Don't forget that a vector is also an organism that transmits disease causing micro-organisms to another organism and it is also a pathway for inserting foreign DNA into the genome of a host cell.

The way I was taught this in Bio: A vector is a means by which foreign DNA can be transplanted into a human cell. I'm glad you had to bring that up, though. My biology teacher was the perfect example on how science should be taught. I saw was, as she retired this past year. She was probably one of the best teachers you could ever find.

> Wait until you get to the multiplication of 3D vectors. Getting cross and dot products becomes really fun, but only after you get through the gruelling proofs and after you understand what's really happening in the 3D space.

Oh, man. Proofs are probably the hardest thing I'll ever do in Math. I mean, I managed to prove (given an already completed proof) something on occassion nobody else in the class could figure out.

And working with 3 dimensions should be really cool, but I think I have another year to go before I work with 3D vectors. I won't be working with parametric surfaces in 3D, since I'm not taking BC Calc. I hear if you miss a day of class in BC Calc, it's like a week's worth of AB Calc.

If you can handle BC Calc easily (or even AB Calc) before you reach college, you are a [E]ing math genius.

13. ### G4scott macrumors 68020

Joined:
Jan 9, 2002
Location:
Austin, TX
#13
I'm a senior in high school taking physics 2 AP with a class of 4 people (including me!)

The teacher has been teaching physics for a while, but hasn't taught the AP class, but he's getting help from my physics 1 teacher I had last year who retired (this teacher taught physics 2 for quite some time...)

As for vectors, we just reviewed them a bit today... Nothing too hard...

Here's a question for some of you math/physics guys...

How fast is the speed of light in furlongs per fortnights (furlongs/fortnights)?

14. ### Backtothemac macrumors 601

Joined:
Jan 3, 2002
Location:
San Destin Florida
#14
Well, my little bro is a friggin brain in case you can't tell. He is going to be something special in life, and he will be successful. I am more proud of him than he will ever know.

On the subject I love that people can enjoy physics. I also admire his ability to start a good thread and then disapear from it

15. ### Taft macrumors 65816

Joined:
Jan 31, 2002
Location:
Chicago
#15
speed of light = aprox. 670617932.5 miles per hour.

1 furlong = 1/8 mile.
1 hour = 1/336 of a fortnight (two weeks, right?)

so...

670617932.5 (miles/hour)
x(8 furlongs / mile)
x(336 hours / fortnight) =

1802621002266.432

Taft

16. ### Backtothemac macrumors 601

Joined:
Jan 3, 2002
Location:
San Destin Florida
#16
Isn't the speed of light 186,000 miles per second?

17. ### B2TM little bro thread starter macrumors member

Joined:
Aug 23, 2002
#17
.............Disappear.......?!?!?!

i have to continually stay and talk and update, well sorry but there was homework and then the server was busy and blah blah blah.....

I'm extremely proud of my calc 2 homework I actually understood it, geez and the teacher has the thickest accent its not even funny.

I REMEMBER 3D Figures from AB Cal ! , they were fun!

18. ### jefhatfield Retired

Joined:
Jul 9, 2000
#18
are you really related to bttm?

and would that make you a gop man? then you must battle with taft, jello, macrain, and myself...he he

welcome to macrumors

jhatfield the democrat from california

19. ### B2TM little bro thread starter macrumors member

Joined:
Aug 23, 2002
#19
i REALLY am related to him, but we are TWO different people, i dunno what kinda party i belong to , cause im only 17, and i don't like george bush anything, or al gore for that matter, but i like nice things , so does that make me a republican, cause they are always the rich ones, and i like change so does that make me a democrat, its all so confusing, i just need to take some kinda test. . . . I hope im not a subconscious socialist, uh oh!

p.s. I come in peace! ! !

20. ### jefhatfield Retired

Joined:
Jul 9, 2000
#20
welcome to macrumors...at 17, you are in good company here since most on macrumors are very young or still in secondary school

21. ### Mr. Anderson Moderator emeritus

Joined:
Nov 1, 2001
Location:
VA
#21
ugh, 3 courses of Linear Algebra in college really got me to hate those damn things - but matrix and vector calculation go hand in hand when working in 3D graphics. While I was in school I had to write my own 3D app in C, and everything to rotate, translate, etc. was a 4x4 matrix calculation with a vector (point) a lot of fun when you got it all working. I think I have that code around somewhere, I might have to dig it up and get a little nostalgic.

D

22. ### Backtothemac macrumors 601

Joined:
Jan 3, 2002
Location:
San Destin Florida
#22
Yet one more success in the leftist media campaign to make the average American youth ignorant to politics.

Why don't you like GW? Why not Gore? Gore is a good man, with a great record, and from your State! Why are republicans the rich ones? Am I rich? Tara, mom and dad, Coley, Troy, Tracie and Kerri, Michael, etc, etc, etc.

Don't let the media's stereotype of either on of the parties distort you opinion of politics or the party. Learn about each and make your own informed decision.

Oh, and BTW, you are a republican.

23. ### Mr. Anderson Moderator emeritus

Joined:
Nov 1, 2001
Location:
VA
#23
nice

you hijacking this physics thread for political badgering? I don't think so!

now - resume contemplation of vectors or I'll be doing some vectoring to your @ss!

24. ### Backtothemac macrumors 601

Joined:
Jan 3, 2002
Location:
San Destin Florida
#24
Hey, he started it Duke! he.he. Yea, vectors smectors. I don't even know what a vector is. Open class, the student is waiting for a lesson. Explain it to me. I can understand concepts like that, but I have never learned them.

25. ### Mr. Anderson Moderator emeritus

Joined:
Nov 1, 2001
Location:
VA
#25
Vectors are a basic part of physics and mechanics (Statics) - I could go in to a long discussion, but sometimes the web has all the info - and I found a place with nice 3D graphics to go along with the description -

http://id.mind.net/~zona/mstm/physics/mechanics/vectors/vectors.html

its all about forces, and a decent understanding of geometry and trig are necessary (sin, cos, etc)

may the vector be with you!