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klasična mehanika - Hrvatska enciklopedija
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Utemeljena je na <a href="https://www.enciklopedija.hr/clanak/newtonovi-zakoni">Newtonovim zakonima</a> mehanike i <a href="https://www.enciklopedija.hr/clanak/galileijevo-nacelo-relativnosti">Galileijevu načelu relativnosti</a>, a obuhvaća: gravitaciju, mehaniku <a href="https://www.enciklopedija.hr/clanak/kruto-tijelo">krutoga tijela</a>, mehaniku <a href="https://www.enciklopedija.hr/clanak/fluid">fluida</a>, mehaniku <a href="https://www.enciklopedija.hr/clanak/titranje">titranja</a> i mehaniku širenja <a href="https://www.enciklopedija.hr/clanak/atmosferski-valovi">valova</a> u elastičnom sredstvu.</p><p>Osnovni pojmovi u klasičnoj mehanici su prostor, vrijeme i masa, a temeljna jednadžba je drugi Newtonov zakon: <span style="font-style: italic; color: #000000;"><span style="font-weight: bold;">F</span></span> = d<span style="font-style: italic; color: #000000;"><span style="font-weight: bold;">p</span></span>/d<span style="font-style: italic; color: #000000;">t</span>, gdje je <span style="font-style: italic; color: #000000;"><span style="font-weight: bold;">F</span></span> sila, <span style="font-style: italic; color: #000000;"><span style="font-weight: bold;">p</span></span> količina gibanja i <span style="font-style: italic; color: #000000;">t</span> vrijeme. Glavni je cilj klasične mehanike odrediti položaj čestice ili tijela u proizvoljnome trenutku ako su poznati položaj i brzina čestice u početnome trenutku.</p><p>U okviru moderne fizike, klasična mehanika može se shvatiti kao aproksimacija koja proizlazi iz zakona <a href="https://www.enciklopedija.hr/clanak/kvantna-mehanika">kvantne mehanike</a> (uz zanemarivo malenu <a href="https://www.enciklopedija.hr/clanak/planckova-konstanta">Planckovu konstantu</a>) i <a href="https://www.enciklopedija.hr/clanak/teorija-relativnosti">teorije relativnosti</a> (uz beskonačno veliku <a href="https://www.enciklopedija.hr/clanak/brzina-svjetlosti">brzinu svjetlosti</a>).</p> </div> </div> </div> <div class="container citiranje"> Citiranje: <p> klasična mehanika. <i>Hrvatska enciklopedija</i>, <i>mrežno izdanje.</i> Leksikografski zavod Miroslav Krleža, 2013. – 2024. Pristupljeno 25.11.2024. <https://www.enciklopedija.hr/clanak/klasicna-mehanika>. </p> </div> <div class="container d-print-none"></div> <div class="container d-print-none"> <button type="button" class="btn btn-secondary" data-bs-toggle="modal" data-bs-target="#mkomentar">Komentar</button> </div> <div class="modal fade" tabindex="-1" id="mkomentar"> <div class="modal-dialog modal-dialog-centered"> <div class="modal-content"> <div class="modal-header"> <h5 class="modal-title">Unesite komentar</h5> <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button> </div> <div class="modal-body"> Komentar: <textarea style="width:100%; height:300px" id="taKomentar" name="taKomentar"></textarea> Potpis: <input type="text" style="width:100%" id="taPotpis" name="taPotpis" /input> </div> <div class="modal-footer"> <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Zatvori</button> <button type="submit" class="btn btn-primary" title="Snimi" value="Snimi" formaction="/Clanak/klasicna-mehanika?handler=ButtonSnimi">Pošalji</button> </div> </div> </div> </div> <br /> <input name="__RequestVerificationToken" type="hidden" value="CfDJ8AafmPaswmdEooPiIBQpxHC7bPBF4tAcbQt69htYGgsILc3ieOlYmwGYUmobG4yLmRrDj5I0NzcwZVH8w_8T8ORPA1wLew5LJ2LvOpETtz7bEkpKIZXams8H9nv5rR4FfzPSktIfAUcAhnxy-DP_cYM" /></form> <script src="/lib/lightbox2/js/lightbox.min.js"></script> <script> lightbox.option({ 'resizeDuration': 200, 'wrapAround': false, 'albumLabel': "slika %1 od %2" }) </script> </main> </div> <div b-5bzbccjy93> <div id="cookieConsent" class="alert alert-info alert-dismissible fade show fixed-bottom" role="alert"> <div class="container"> Naše web stranice koriste kolačiće kako bi Vam omogućili najbolje korisničko iskustvo, za analizu prometa i korištenje društvenih mreža. <a href="/UvjetiKoristenja">Doznaj više.</a> </div> <div class="d-grid gap-2 d-md-flex justify-content-md-end"> <button type="button" class="btn btn-secondary accept-policy me-md-2" data-dismiss="alert" aria-label="Close" data-cookie-string=".AspNet.Consent=yes; expires=Tue, 25 Nov 2025 05:55:00 GMT; path=/; secure; samesite=none">Prihvati</button> </div> </div> <script> (function () { var button = document.querySelector("#cookieConsent button[data-cookie-string]"); button.addEventListener("click", function (event) { document.cookie = button.dataset.cookieString; $("#cookieConsent").hide(); }, false); })(); </script> </div> <footer b-5bzbccjy93 class="border-top footer text-muted" id="myFooter"> <div b-5bzbccjy93 class="container text-center"> <img style="height:48px; vertical-align:text-top;" src="/images/lzmklogo.png" /> </div> <div b-5bzbccjy93 class="container text-center"> © 2024. <a b-5bzbccjy93 href="https://www.lzmk.hr">Leksikografski zavod <i b-5bzbccjy93>Miroslav Krleža</i></a> </div> </footer> <button b-5bzbccjy93 type="button" title="Top" class="btn btn-secondary btn-floating btn-lg" id="btn-back-to-top"> <svg b-5bzbccjy93 xmlns="http://www.w3.org/2000/svg" width="18" height="18" fill="currentColor" class="bi bi-caret-up-fill"> <path b-5bzbccjy93 d="m7.247 4.86-4.796 5.481c-.566.647-.106 1.659.753 1.659h9.592a1 1 0 0 0 .753-1.659l-4.796-5.48a1 1 0 0 0-1.506 0z" /> </svg> </button> <script src="/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script> <script src="/js/site.js?v=HFdDLbM0HxvrAwFgkX5IgRBv1htKZvv7gXFyyLjyFbI"></script> </body> </html>