2. Newtonov pohybový zákon

Kategorie: Fyzika a astronómia (celkem: 482 referátů a seminárek)

Informace o referátu:

  • Přidal/a: anonymous
  • Datum přidání: 05. července 2007
  • Zobrazeno: 11254×

Příbuzná témata



2. Newtonov pohybový zákon

Newtonov zákon sily vo formulácii platnej pre hmotný bod hovorí: Sila pôsobiaca na hmotný bod je úmerná súčinu jeho hmoty a zrýchlenia, ktoré mu udeľuje.
Touto vetou vyslovený obsah Newtonovho zákona sily vyžaduje bližšie objasnenie, pretože sa tu hovorí o sile a hmote, fyzikálnych veličinách.
Z Newtonovho zákonu zotrvačnosti vyplýva, že len pôsobenie iných telies môže zmeniť pohybový stav telesa pohybujúceho sa vzhľadom na inerciálnu vzťažnú sústavu určitou rýchlosťou. Pojem sila z bežnej reči do svojich fyzikálnych úvah , nazývame vo fyzike silou pôsobiacou na dané teleso fyzikálnou veličinou vektorovej povahy, charakterizujúcu tie účinky iných telies, ktoré sa môžu prejaviť zmenou jeho pohybového stavu. Pritom smer sily stotožňujeme so smerom zrýchlenia, ktoré sila vyvoláva, a bod telesa, v ktorom sa silové účinky bezprostredne uplatňujú, nazývame pôsobiskom sily.
Vieme, že tie isté vplyvy, ktoré za vhodných podmienok, mienia pohybový stav telies, pri pôsobení sa tak nazývané pružné telesá menia aj ich tvar a rozmery., čiže deformujú ich. Majme na mysli dve telesá, T1 a T2 , a pôsobme na ne postupne silami S1 a S2. Príslušné zrýchlenia nech majú absolútne hodnoty podľa tabuľky:

T1 T2
S1
S2 a11 a12
a21 a22

V ktorej napríklad zrýchlenie a12 je zrýchlenie udelené silou S1 telesu T2. Konaním pokusov sa môžeme presvedčiť, že je splnená úmera:

a11 : a21 = a12 : a22

Táto úmera je vlastným obsahom Newtonovho zákona sily. Hovorí, že podiel absolútnych hodnôt zrýchlení, ktoré dve rôzne sily udeľujú tomuže telesu, od zvoleného telesa nezávisí. Je preto prirodzené z dvoch síl pokladať napríklad druhú za súčin prvej sily a podielu zrýchlení a2 a a1 , ktoré ony tomu istému telesu udeľujú, t.j. pre ich hodnoty P2 aP1 písať úmeru:

P2 : P1 = a2 : a1

rovnocennú so vzorcom

P2 = a2/a1. P1

Na meranie síl podľa práve napísaného spôsobu (dynamické meranie síl) treba už len zvoliť nejakú silu za jednotku sily. Ak zvolená jednotka sily, označme ju P1, udeľuje nejakému telesu zrýchlenie a1 a meraná sila udeľuje tomu istému telesu zrýchlenie a, je hodnota meranej sily P určená vzorcom:

P = a/a1.

P1

Úmeru a11 : a21 = a12 : a22 môžeme však upraviť na tvar:

a11 : a12 = a21 : a22
V tomto tvare písaný vzťah medzi zrýchleniami, ktoré udeľujú dve rôzne sily, dvom rôznym telesám, vyjadruje, že podiel zrýchlení, ktoré teraz tá istá sila udeľuje dvom rôznym telesám, je od sily nezávislí.
Ak sa nejaké teleso za pôsobenia nejakej sily dostáva do pohybu, ktorý sa vyznačuje veľkým zrýchlením, hovoríme, že teleso má len malú zotrvačnú hmotu. Ak toto zrýchlenie je malé, hovoríme, že toto teleso má veľkú hmotu. Hmota telies je fyzikálna veličina, ktorá vyjadruje jednu z najdôležitejších vlastností materiálnych telies. Charakterizuje odpor telies proti zmenám ich pohybového stavu.

adii12d
bad, > | 01. prosince 2009
hdjm
Rakshabandhanrakhi
sasa, www.rakshabandhanrakhi.com | 08. srpna 2016
www.rakshabandhanrakhi.com
This is my first time I visit here. I found so many interesting stuff in your blog especially its discussion.
From the tons of comments on your articles, I guess I am not the only one having all the enjoyment here! Keep up the good work. Thanks once again.
I really thank the author of this article, the article has great significance for me, it just leads me to do better things for this life. Very meaningful, thank you very much, wish you happy.
Well this article that i've been waited for so long. I need this article to complete my assignment in the college, and it has same topic with your article. Thanks, great share.
asd
xender , http://www.xenderforpcapp.com | 04. února 2017
I am very enjoyed for this blog. Its an informative
nba live mobile hack generator
nba live mobile hack generator, http://hacknbalivemobile.com/ | 04. února 2017
Always so interesting to visit your site.What a great info, thank you for sharing. this will help me so much in my learning
Very cozy looking rooms. Let me know if your going to Mexico. Oh and btw. you should read our Tipping in Mexico guide if you do. It will save you a lot of awkward moments.
Dog collars
Dog collars, https://www.linkhearts.com/ | 19. února 2017
The most inspiring stuff commonly is probably the most dull or boring concern. a single rooster may not be in the same woody plant strip very long, and also the pets within the pine is a kind of weight, always want to consult the next stars, the particular fowl because the plants are really hesitant to facial expression an equal beautiful places day by day.
best stethoscope brand for doctors
best stethoscope brand for doctors, https://goo.gl/f3b2Qg | 21. února 2017
I would like to thank you for the efforts you have made in writing this article. I am hoping the same best work from you in the future as well..
Alpha’s Area
Alpha’s Area, http://alphasarea.com | 21. února 2017
Great info! I recently came across your blog and have been reading along. I thought I would leave my first comment. I don’t know what to say except that I have 
Your post is very helpful to get some effective tips to reduce weight properly. You have shared various nice photos of the same. I would like to thank you for sharing these tips. Surely I will try this at home. Keep updating more simple tips like this.
wedding photography
wedding photography, http://lightheartwedding.com.au | 02. března 2017
A very awesome blog post. We are really grateful for your blog post. You will find a lot of approaches after visiting your post. I was exactly searching for. Thanks for such post and please keep it up. Great work
instagram search
instagram search, http://brandfuge.io/instagram/search/ | 04. března 2017
An interesting dialogue is price comment. I feel that it is best to write more on this matter, it may not be a taboo topic however usually individuals are not enough to talk on such topics. To the next. Cheers.
amber stud earrings
, https://www.therussianstore.com/russian-amber-earrings.html | 06. března 2017
It has fully emerged to crown Singapore's southern shores and undoubtedly placed her on the global map of residential landmarks. I still scored the more points than I ever have in a season for GS. I think you would be hard pressed to find somebody with the same consistency I have had over the years so I am happy with that.
download product key generators
download product key generators, http://coolwarezdownloadplace.ru/ | 08. března 2017
The website is looking bit flashy and it catches the visitors eyes. Design is pretty simple and a good user friendly interface.
tabletop fireplace
, http://www.topgoodsforhome.com/ | 09. března 2017
Just saying thanks will not just be sufficient, for the fantasti c lucidity in your writing. I will instantly grab your rss feed to stay informed of any updates.
ONE PIECE THOUSAND STORM Hack
ONE PIECE THOUSAND STORM Hack, http://withoutwax.tv | 09. března 2017
I need to to thank you for ones time for this particularly fantastic read!! I definitely really liked every part of it and i also have you saved to fav to look at new information in your site.
Yu Gi Oh Duel Links Hack
, http://weadvance.org | 10. března 2017
Just saying thanks will not just be sufficient, for the fantasti c lucidity in your writing. I will instantly grab your rss feed to stay informed of any updates.
I have to search sites with relevant information on given topic and provide them to teacher our opinion and the article.
cheap flyer printing bristol
, http://www.55printing.com/cheap-brochure-printing/ | 22. března 2017
I feel really happy to have seen your webpage and look forward to so many more entertaining times reading here. Thanks once more for all the details.
Start getting your free limitless golds by utilizing our very personal model of conflict of kings hack.
Attractive section of content. I just stumbled upon your site and in accession capital to assert that I get in fact enjoyed account your blog posts. Anyway I will be subscribing to your augment and even I achievement you access consistently fast.
Thanks for posting this info. I just want to let you know that I just check out your site and I find it very interesting and informative. I can't wait to read lots of your posts.
Tremendous things here. I am very satisfied to see your article. Thanks a lot and I'm looking ahead to touch you. Will you please drop me a e-mail?
Hi mates, its enormous piece of writing on the topic of teachingand completely explained, keep it up all the time.
professional roofing inc arvada co
professional roofing inc arvada co, http://ddavisdesign.com/1991/07/07/debs-bio/ | 23. března 2017
I pay a visit day-to-day a few blogs and information sites to read articles, except this weblog presents feature based articles.
www.gsmlover.com
www.gsmlover.com, http://www.gsmlover.com/chinese-mobile/ | 23. března 2017
Users can take advantage of live chat sessions with friends through IM client which enables the use of various instant messenger providers like Google - Talk and Windows - Live. The Blackberry Bold 9790 ight not eclipse the Bold 9900 inn certain areas but it outshines its sister model iin terms of still photography. Sonyy Ericsson is back using its latest installment in the XPERIA serie of Smartphones.
Hi there friends, how is everything, and what you would like to say on the topic of this article, in my view its actually awesome in support of me.
Awesome things here. I am vvery glad to look your post. Thank you so much and I am having a look ahead to touch you. Will you kindly drop me a e-mail?
Hi Dear, are you in fact visiting this web site daily, if so afterward you will without doubt obtain fastidious knowledge.
That is really attention-grabbing, You're an overly skilled blogger. I've joined your feed and look forward to looking for more of your excellent post. Also, I've shared your site in my social networks
I thiink this web site haas gott some really excellent info for everyone :D.
Hi there, I enjoy reading through your article. I wanted to write a little comment to support you.
Oh my goodness! Awesome article dude! Many thanks, However I am going through difficulties with your RSS. I don't know the reason why I am unable to subscribe to it. Is there anybody else getting the same RSS issues? Anybody who knows the solution can you kindly respond? Thanks!!
each time i used to read smaller articles that also clear their motive, and that is also happening with this article which I am reading at this time.
Every weekend i used to go to see this web site, as i wish for enjoyment, for the reason that this this site conations in fact good funny material too.
Design Your Page
Design Your Page, http://firsturl.de/30s3I0T | 25. března 2017
Definitely consider that that you stated. Your favorite reason appeared to be on the net the simplest thing to keep in mind of. I say to you, I certainly get irked whilst other people think about worries that they plainly don't realize about. You managed to hit the nail upon the highest and defined out the entire thing without having side-effects , other people can take a signal. Will probably be again to get more. Thank you
fun play
fun play, http://ariscool.com/gaming28 | 26. března 2017
The most effective means bring in some form of e-book and enjoy this almost from anywhere is during the entire fascinating process involving mp 3 mp3 audio books. The true sound e-book outlets that always one thinks of as rapidly as.
Hello there! I could have sworn I've visited this website before but after going through many of the articles I realized it's new to me. Nonetheless, I'm definitely pleased I found it and I'll be book-marking it and checking back regularly!
Thank you for the auspicious writeup. It in fact was a amusement account it. Look advanced to far added agreeable from you! By the way, how can we communicate?
pinterest.com login
pinterest.com login, http://ads-market.net/user/profile/610 | 27. března 2017
Search weddings on Pinterest and you may find more ideas then it is possible to toss a bouquet at. " Click on a unique pin to determine a larger image, view comments and look for the link on the original.
Wow, this article is pleasant, my sister is analyzing these kinds of things, so I am going to inform her.
There are many options for creating a board, from painting to papering, all dependent within the level of the enthusiasm, the accessible materials and exactly how you want the effect to look and work. Following people and boards is usually a great method to bring more ideas, inspiration and entertainment to your website.
http://electricsuppliercompany.fourfour.com
http://electricsuppliercompany.fourfour.com, http://electricsuppliercompany.fourfour.com | 27. března 2017
Visit our site to find more about wedding photographer Northern Virginia. We offer engagement and proposal photography in Va.
This storage, trash can or wood bin is totally free-standing with a wooden skid foundation that tends to make it effortless to move.
Your way of describing everything in this paragraph is actually nice, every one be able to simply be aware of it, Thanks a lot.
Do you mind if I quote a couple of your articles as long as I provide credit and sources back to your site? My website is in the very same niche as yours and my users would definitely benefit from a lot of the information you present here. Please let me know if this alright with you. Regards!
Thanks for sharing your thoughts on .... Regards
Nový příspěvek



Ochrana proti spamu. Kolik je 2x4?