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Updated Apr 1, 2026

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9 pages

Osnove hitrosti in pospeška

Hitrost in pospešek sta osnova za razumevanje gibanja - od... Show more

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# Hitrost in pospešek

Uvod v hitrost in pospešek

Gibanje je povsod okoli nas od hoje v šolo do vožnje z avtobusom. Da bi
lahko natančno op

Osnovni pojmi gibanja

Gibanje opazimo povsod - ko hodiš v šolo, ko se vozi avtobus ali ko pade jabolko z drevesa. Gibanje je preprosto spreminjanje lege telesa v prostoru.

Za opis gibanja potrebujemo tri osnovne količine: pot (koliko metrov si prešel), čas (koliko sekund si potreboval) in hitrost (kako hitro si se premikal). Pospešek pa nam pove, ali se premikaš vedno hitreje ali počasneje.

💡 Zapomni si osnovne enote: pot v metrih (m), čas v sekundah (s), hitrost v m/s in pospešek v m/s².

Vsaka od teh količin ima svojo formulo, ki jo boš potreboval za reševanje nalog.

Razumevanje hitrosti

Povprečna hitrost ti pove, koliko poti opravi telo v določenem času. Formulo v = s/t boš uporabljal pri večini nalog.

V vsakdanjem življenju pogosto slišiš hitrost v km/h (kilometri na uro), v fiziki pa uporabljamo m/s. Pretvarjanje je enostavno: iz km/h v m/s deliš s 3,6, iz m/s v km/h pa množiš s 3,6.

Enakomerno gibanje pomeni, da se telo premika s konstantno hitrostjo - v enakih časih opravi enako pot. Pri tem je pospešek enak nič, ker se hitrost ne spreminja.

💡 Primer: 36 km/h = 36 ÷ 3,6 = 10 m/s. To je hitrost teka!

Grafi enakomernega gibanja

Graf poti v odvisnosti od časa $s-t graf$ za enakomerno gibanje je premica, ki se začne v izhodišču. Večji kot je naklon premice, večja je hitrost telesa.

Graf hitrosti v odvisnosti od časa $v-t graf$ pa je pri enakomernem gibanju vodoravna črta, saj se hitrost sploh ne spreminja.

Ta grafa ti pomagata vizualno razumeti gibanje in so pogosto del testnih vprašanj.

Pospešek - ključ do spreminjanja

Pospešek ti pove, kako hitro se spreminja hitrost. Formula je a = $v_končna - v_začetna$ /t.

Pozitiven pospešek pomeni, da telo pospešuje (kot avto, ki speljuje), negativen pospešek ali pojemek pa, da zavira (kot avto pred semaforjem).

Enakomerno pospešeno gibanje ima konstanten pospešek - hitrost se v enakih časih poveča za enako vrednost. Najboljši primer je prosto padanje, kjer je pospešek vedno 9,8 m/s².

💡 Graf v-t za pospešeno gibanje je naraščajoča premica - naklon predstavlja pospešek!

Reševanje praktičnih primerov

Poglejmo si tipičen primer: kolesar prevozi 45 km v 2,5 ure. Njegova povprečna hitrost je v = 45/2,5 = 18 km/h oziroma 5 m/s.

Pri računanju pospeška si vzemi primer motorista, ki v 8 sekundah doseže hitrost 90 km/h $25 m/s$ . Pospešek je a = 25/8 = 3,125 m/s².

Pojemek izračunavaš enako - vlak, ki se iz hitrosti 54 km/h $15 m/s$ ustavi v 15 sekundah, ima pospešek a = (0-15)/15 = -1 m/s².

💡 Negativni predznak pri pospešku vedno pomeni zaviranje!

Napake, ki se jim izogni

Največja napaka pri reševanju je neupoštevanje enot. Vedno preveri, ali so vse enote usklajene - najbolje pretvori vse v osnovne enote (m, s).

Zapomni si: če telo speljuje z mesta, je začetna hitrost 0. Če se ustavi, je končna hitrost 0. Telo lahko ima veliko hitrost, a pospešek 0 (enakomerno gibanje).

Ploščina pod v-t grafom predstavlja opravljeno pot - to ti lahko pomaga pri grafičnih nalogah.

💡 Ključno pretvarjanje: 1 m/s = 3,6 km/h. To je osnova za vse naloge!

Povzetek za test

Osnovne formule: hitrost v = s/t in pospešek a = $v_k - v_z$ /t. Osnovne enote: pot v metrih, čas v sekundah, hitrost v m/s, pospešek v m/s².

Vrste gibanja so odvisne od hitrosti in pospeška: mirovanje $v=0, a=0$ , enakomerno gibanje $v=konstanta, a=0$ , pospešeno gibanje (a>0) in pojemajoče gibanje (a<0).

S temi osnovami lahko rešiš večino nalog o gibanju. Vadi pretvarjanje enot in pozorno beri, kaj naloga sprašuje.

💡 Vedno najprej zapiši podatke, nato formulo in šele potem računaj!

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167

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Updated Apr 1, 2026

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9 pages

Osnove hitrosti in pospeška

Hitrost in pospešek sta osnova za razumevanje gibanja - od teka do vožnje z avtom. Te količine ti omogočajo natančno opisati, kako se stvari premikajo okoli tebe.

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Osnovni pojmi gibanja

Gibanje opazimo povsod - ko hodiš v šolo, ko se vozi avtobus ali ko pade jabolko z drevesa. Gibanje je preprosto spreminjanje lege telesa v prostoru.

💡 Zapomni si osnovne enote: pot v metrih (m), čas v sekundah (s), hitrost v m/s in pospešek v m/s².

Vsaka od teh količin ima svojo formulo, ki jo boš potreboval za reševanje nalog.

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Razumevanje hitrosti

Povprečna hitrost ti pove, koliko poti opravi telo v določenem času. Formulo v = s/t boš uporabljal pri večini nalog.

V vsakdanjem življenju pogosto slišiš hitrost v km/h (kilometri na uro), v fiziki pa uporabljamo m/s. Pretvarjanje je enostavno: iz km/h v m/s deliš s 3,6, iz m/s v km/h pa množiš s 3,6.

Enakomerno gibanje pomeni, da se telo premika s konstantno hitrostjo - v enakih časih opravi enako pot. Pri tem je pospešek enak nič, ker se hitrost ne spreminja.

💡 Primer: 36 km/h = 36 ÷ 3,6 = 10 m/s. To je hitrost teka!

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Grafi enakomernega gibanja

Improve your grades

Join milions of students