{"id":680959,"date":"2021-08-06T09:52:29","date_gmt":"2021-08-06T07:52:29","guid":{"rendered":"https:\/\/rothschenk.de\/epizoda-9-zrychleni\/"},"modified":"2025-06-30T17:02:50","modified_gmt":"2025-06-30T15:02:50","slug":"epizoda-9-zrychleni","status":"publish","type":"post","link":"https:\/\/rothschenk.de\/cz\/epizoda-9-zrychleni\/","title":{"rendered":"Epizoda 9: Zrychlen\u00ed"},"content":{"rendered":"\n

Zrychlen\u00ed je fyzik\u00e1ln\u00ed jev, kter\u00fd n\u00e1s neust\u00e1le obklopuje. \u010casto si to neuv\u011bdomujeme, a pokud ano, tak to bol\u00ed, nap\u0159. kdy\u017e si klepnete kladivem do palce. <\/p>\n\n

T\u00edmto blogem LaSi bych cht\u011bl ud\u011blat \u010d\u00e1ru od ka\u017edodenn\u00edch situac\u00ed ke speci\u00e1ln\u00edm po\u017eadavk\u016fm na p\u0159epravu n\u00e1mo\u0159n\u00edm kontejnerem nebo kamionem.<\/p>\n\n

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V\u00fdpo\u010det zrychlen\u00ed<\/h2>\n\n
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Ve fyzice hovo\u0159\u00edme o rovnom\u011brn\u011b zrychlen\u00e9m p\u0159ekladu s po\u010d\u00e1te\u010dn\u00ed rychlost\u00ed nebo bez n\u00ed.<\/p>\n\n\n\n

Zrychlen\u00ed (a) se vypo\u010d\u00edt\u00e1 vyd\u011blen\u00edm rychlosti (v) \u010dasem (t). Zrychlen\u00ed m\u00e1 jednotku m\/s2<\/sup>. <\/p>\n\n\n\n

Zm\u011bny rychlosti jsou \u010dasto zp\u016fsobeny brzd\u011bn\u00edm, kter\u00e9 se ve fyzice ozna\u010duje jako zpomalen\u00ed. V\u00fdpo\u010det je stejn\u00fd, pouze se m\u011bn\u00ed znam\u00e9nko z + na – . <\/p>\n<\/div>\n<\/div>\n\n

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V praxi je tak\u00e9 d\u016fle\u017eit\u00fd prvek hmotnosti. P\u0159i dotazu na zaji\u0161t\u011bn\u00ed n\u00e1kladu se ji\u017e pravd\u011bpodobn\u011b jeden nebo dva lid\u00e9 dozv\u011bd\u011bli: je to tak t\u011b\u017ek\u00e9, \u017ee se to nem\u016f\u017ee v\u016fbec h\u00fdbat. A pr\u00e1v\u011b v tom spo\u010d\u00edv\u00e1 probl\u00e9m, proto\u017ee hmotnost m\u00e1 tu vlastnost, \u017ee chce udr\u017eet sv\u016fj sou\u010dasn\u00fd stav a jak\u00e9koli zm\u011bn\u011b se br\u00e1n\u00ed silou. <\/p>\n\n

Tento jev m\u016f\u017ee ka\u017ed\u00fd pozorovat u p\u00e1su pokladny v diskontn\u00edm obchod\u011b. Zbo\u017e\u00ed se p\u0159em\u00edst\u00ed poka\u017ed\u00e9, kdy\u017e se p\u00e1s posune vp\u0159ed nebo zpomal\u00ed. Naskl\u00e1dan\u00e9 n\u00e1kupn\u00ed zbo\u017e\u00ed sklouzne, lahve se p\u0159evr\u00e1t\u00ed nebo se za\u010dnou kut\u00e1let. P\u0159esn\u011b tot\u00e9\u017e se d\u011bje p\u0159i p\u0159eprav\u011b. <\/p>\n\n

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P\u0159\u00edpadov\u00e1 studie<\/h3>\n\n

Vztah mezi hmotnost\u00ed a zrychlen\u00edm si m\u016f\u017ee ka\u017ed\u00fd vyzkou\u0161et v praxi na n\u00e1sleduj\u00edc\u00edm p\u0159\u00edkladu.<\/p>\n\n

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F\u00e1ze 1:<\/h4>\n\n\n\n

Vezm\u011bte h\u0159eb\u00edk o pr\u016fm\u011bru 120 mm a kladivo o hmotnosti 500 g. Um\u00edst\u011bte \u0161pi\u010dku h\u0159eb\u00edku na \u0161palek a pot\u00e9 polo\u017ete kladivo na hlavi\u010dku h\u0159eb\u00edku. V\u00fdsledkem je, \u017ee h\u0159eb\u00edk bude minim\u00e1ln\u011b a nepatrn\u011b tla\u010dit do m\u011bkk\u00e9ho d\u0159eva. Pokud kladivo op\u011bt vyjmete, h\u0159eb\u00edk se obvykle op\u011bt p\u0159evr\u00e1t\u00ed. Z fyzik\u00e1ln\u00edho hlediska je \u00fa\u010dinn\u00e1 pouze s\u00edla vypl\u00fdvaj\u00edc\u00ed z hmotnosti kladiva n\u00e1soben\u00e1 gravita\u010dn\u00edm zrychlen\u00edm. <\/p>\n<\/div>\n<\/div>\n\n

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F\u00e1ze 2:<\/h4>\n\n\n\n

Cvi\u010d\u00edc\u00ed zvedne kladivo, zrychl\u00ed sm\u011brem k hlavi\u010dce h\u0159eb\u00edku a douf\u00e1, \u017ee ji zas\u00e1hne. Toto dodate\u010dn\u00e9 zrychlen\u00ed v\u00fdznamn\u011b zvy\u0161uje vytv\u00e1\u0159enou s\u00edlu: <\/p>\n\n\n\n

S\u00edla (F) = hmotnost (m) * zrychlen\u00ed (a)<\/p>\n<\/div>\n<\/div>\n\n

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F\u00e1ze 3:<\/h4>\n\n\n\n

P\u0159i \u00faderu se kladivo prudce zpomal\u00ed a s\u00edla zatlu\u010de h\u0159eb\u00edk do d\u0159eva. V z\u00e1vislosti na zrychlen\u00ed, hmotnosti kladiva a t\u0159en\u00ed ve d\u0159ev\u011b je zapot\u0159eb\u00ed n\u011bkolika \u00fader\u016f. <\/p>\n\n\n\n

V z\u00e1vislosti na situaci pou\u017eije cvi\u010d\u00edc\u00ed jin\u00e9 kladivo, aby vytvo\u0159il po\u017eadovanou s\u00edlu. Samoz\u0159ejm\u011b je tak\u00e9 nutn\u00e1 ur\u010dit\u00e1 technika. Ka\u017ed\u00fd, kdo n\u011bkdy ude\u0159il do „Lukase“, v\u00ed, o \u010dem mluv\u00edm. <\/p>\n<\/div>\n<\/div>\n\n

Tento z\u00e1kladn\u00ed princip se skr\u00fdv\u00e1 za mnoha situacemi p\u0159i zaji\u0161\u0165ov\u00e1n\u00ed z\u00e1t\u011b\u017ee. Nap\u0159\u00edklad kdy\u017e n\u00e1klad nen\u00ed ulo\u017een t\u011bsn\u011b u p\u0159ep\u00e1\u017eky a \u0159idi\u010d n\u00e1kladn\u00edho vozidla mus\u00ed brzdit. N\u00e1klad jede aktu\u00e1ln\u00ed rychlost\u00ed (f\u00e1ze 2) a p\u0159i brzd\u011bn\u00ed je negativn\u011b zrychlen (f\u00e1ze 3). \u010c\u00edm v\u011bt\u0161\u00ed je rychlost a \u010d\u00edm del\u0161\u00ed je vzd\u00e1lenost, na kterou m\u016f\u017ee nabrat hybnost, t\u00edm v\u011bt\u0161\u00ed je s\u00edla n\u00e1razu do \u010deln\u00ed st\u011bny. <\/p>\n\n

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V\u00fdpo\u010det energie<\/h2>\n\n
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Fyzik\u00e1ln\u011b se to vyjad\u0159uje pomoc\u00ed vzorce pro v\u00fdpo\u010det energie<\/strong>. Tento vzorec obsahuje tak\u00e9 kvadr\u00e1t rychlosti(V2<\/sup><\/strong>). <\/p>\n\n\n\n

Mo\u017en\u00e1 si n\u011bkte\u0159\u00ed z v\u00e1s vzpomenou na ot\u00e1zku z dob \u0159idi\u010dsk\u00e9ho pr\u016fkazu: Jak se zm\u011bn\u00ed brzdn\u00e1 dr\u00e1ha p\u0159i zdvojn\u00e1soben\u00ed rychlosti?<\/p>\n\n\n\n

Odpov\u011b\u010f: z\u010dty\u0159n\u00e1sob\u00ed se <\/strong>. To je zp\u016fsobeno kvadr\u00e1tem rychlosti. Energie (n\u00e1razov\u00e1 s\u00edla na \u010deln\u00ed st\u011bnu) tedy tak\u00e9 roste s ujetou rychlost\u00ed. <\/p>\n<\/div>\n<\/div>\n\n

Zrychlen\u00ed a t\u0159en\u00ed<\/h2>\n\n

N\u00e1klad se pohybuje v\u017edy, kdy\u017e je zrychlen\u00ed\/zpomalen\u00ed v\u011bt\u0161\u00ed ne\u017e t\u0159en\u00ed (koeficient t\u0159en\u00ed \u00b5<\/strong>). To znamen\u00e1, \u017ee dokud je zrychlen\u00ed\/zpomalen\u00ed men\u0161\u00ed ne\u017e t\u0159en\u00ed mezi n\u00e1kladem a lo\u017enou plochou, z\u016fst\u00e1v\u00e1 n\u00e1klad na m\u00edst\u011b. Teprve kdy\u017e jsou v\u011bt\u0161\u00ed, b\u0159emeno se pohybuje trhav\u011b. <\/p>\n\n

Zpravidla nedoch\u00e1z\u00ed k postupn\u00e9mu p\u0159echodu. N\u00e1kladn\u00ed jednotky ohro\u017een\u00e9 p\u0159evr\u00e1cen\u00edm se v\u0161ak nejprve<\/strong> za\u010dnou p\u0159evracet a pot\u00e9 sklouz\u00e1vaj\u00ed<\/strong>. To lze dob\u0159e demonstrovat j\u00edzdn\u00edmi zkou\u0161kami. <\/p>\n\n

Tento p\u0159\u00edklad jasn\u011b ukazuje, \u017ee samotn\u00e9 protiskluzov\u00e9 roho\u017ee<\/a> p\u0159edstavuj\u00ed pouze teoretick\u00e9 zlep\u0161en\u00ed zaji\u0161t\u011bn\u00ed n\u00e1kladu. Mus\u00ed b\u00fdt dopln\u011bny dal\u0161\u00edmi opat\u0159en\u00edmi, jako je nap\u0159\u00edklad upevn\u011bn\u00ed. <\/p>\n\n

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Na lo\u017en\u00e9 plo\u0161e stoj\u00ed hromada plastov\u00fdch krabic bez dal\u0161\u00edho zaji\u0161t\u011bn\u00ed.<\/p>\n<\/div>\n\n\n\n

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P\u0159i brzd\u011bn\u00ed se posouvaj\u00ed dop\u0159edu, ani\u017e by se p\u0159evr\u00e1tily.<\/p>\n<\/div>\n<\/div>\n\n

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Pro dodate\u010dn\u00e9 zaji\u0161t\u011bn\u00ed n\u00e1kladu byly krabice um\u00edst\u011bny na protiskluzov\u00e9 podlo\u017eky.<\/p>\n<\/div>\n\n\n\n

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P\u0159i brzd\u011bn\u00ed se okam\u017eit\u011b za\u010dnou p\u0159evracet.<\/p>\n<\/div>\n<\/div>\n\n

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Upevn\u011bn\u00ed n\u00e1kladu vzadu<\/h2>\n\n

Proto je d\u016fle\u017eit\u00e9 zabr\u00e1nit pohybu n\u00e1kladu<\/strong>. Nejjednodu\u0161\u0161\u00edm \u0159e\u0161en\u00edm je pozitivn\u00ed zaji\u0161t\u011bn\u00ed. Je v\u0161ak t\u0159eba poznamenat, \u017ee pohybu n\u00e1kladu je t\u0159eba zabr\u00e1nit ve v\u0161ech sm\u011brech, proto\u017ee po pohybu ve sm\u011bru zrychlen\u00ed\/zpomalen\u00ed obvykle n\u00e1sleduje reakce v opa\u010dn\u00e9m sm\u011bru. N\u011bkdy je zpochyb\u0148ov\u00e1no upevn\u011bn\u00ed n\u00e1kladu vzadu. <\/p>\n\n

Hlavn\u00ed \u010d\u00e1st tohoto zp\u011btn\u00e9ho zrychlen\u00ed vznik\u00e1 jako reakce na nouzov\u00e9 brzd\u011bn\u00ed (odrazov\u00fd efekt), proto\u017ee energie obsa\u017een\u00e1 v z\u00e1t\u011b\u017ei nen\u00ed zcela vy\u010derp\u00e1na.<\/p>\n\n

N\u00e1sleduj\u00edc\u00ed p\u0159\u00edklad je ze silni\u010dn\u00edho testu. Hmotnost n\u00e1kladu je p\u0159ibli\u017en\u011b 1 200 kg, rychlost p\u0159ibli\u017en\u011b 25 km\/h. <\/p>\n\n

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Po 5sekundov\u00e9m videoz\u00e1znamu vozidlo prudce zabrzd\u00ed z rychlosti 25 km\/h a n\u00e1klad o hmotnosti 1 200 kg se p\u0159evr\u00e1t\u00ed dop\u0159edu, proto\u017ee nebyl pozitivn\u011b ulo\u017een na m\u0159\u00ed\u017eov\u00e9 sk\u0159\u00edni.<\/p>\n<\/div>\n\n\n\n

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Ihned pot\u00e9 dojde k pohybu (odrazu) sm\u011brem dozadu. O pouh\u00e9 2 sekundy pozd\u011bji se n\u00e1klad t\u00e9m\u011b\u0159 \u00fapln\u011b p\u0159evr\u00e1t\u00ed, proto\u017ee kinetick\u00e1 energie nebyla b\u011bhem nouzov\u00e9ho brzd\u011bn\u00ed zcela rozpt\u00fdlena. <\/p>\n<\/div>\n<\/div>\n\n

Proto mus\u00ed b\u00fdt n\u00e1klad zaji\u0161t\u011bn tak\u00e9 vzadu.<\/strong><\/p>\n\n

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V n\u00e1kladn\u00ed doprav\u011b se tento proces – pln\u00e9 brzd\u011bn\u00ed p\u0159i 0,8 g – obvykle uskute\u010dn\u00ed pouze jednou. P\u0159i p\u0159eprav\u011b kontejnerov\u00fdmi lod\u011bmi, kter\u00e9 mohou p\u0159i valen\u00ed rovn\u011b\u017e dos\u00e1hnout zrychlen\u00ed 0,8 g, m\u016f\u017ee k tomuto pohybu doj\u00edt 2-3kr\u00e1t za minutu. Tato nep\u0159etr\u017eit\u00e1 zrychlen\u00ed jsou jednou ze zvl\u00e1\u0161tnost\u00ed kontejner\u016f. <\/p>\n\n

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Z\u00e1v\u011br<\/h2>\n\n

Odpov\u011bdn\u00fd naklada\u010d\/steward je proto povinen posoudit konkr\u00e9tn\u00ed situaci na n\u00e1kladn\u00edm vozidle nebo v kontejneru, odhadnout nebo vypo\u010d\u00edtat s\u00edly a pot\u00e9 p\u0159ijmout nezbytn\u00e1 opat\u0159en\u00ed. V\u00fdpln\u011b mezer mus\u00ed b\u00fdt samoz\u0159ejm\u011b schopny odolat trval\u00e9mu zat\u00ed\u017een\u00ed. Nap\u0159\u00edklad lepenkov\u00e9 distan\u010dn\u00ed vlo\u017eky jsou ve vlhk\u00e9m prost\u0159ed\u00ed sp\u00ed\u0161e nevhodn\u00e9. <\/p>\n\n

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Bezpe\u010dnostn\u00ed opat\u0159en\u00ed<\/strong> jsou se\u0159azena podle \u00fa\u010dinnosti takto:<\/p>\n\n\n\n

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  1. Ulo\u017een\u00ed ve tvaru kloubu<\/li>\n\n\n\n
  2. Vypl\u0148te mezery a vytvo\u0159te t\u011bsn\u00e9 ulo\u017een\u00ed<\/li>\n\n\n\n
  3. P\u0159\u00edm\u00e9 upevn\u011bn\u00ed je tak\u00e9 metodou tvarov\u00e9 mont\u00e1\u017ee.<\/li>\n\n\n\n
  4. Kombinace p\u0159\u00edm\u00e9ho upevn\u011bn\u00ed s protiskluzov\u00fdmi roho\u017eemi<\/li>\n\n\n\n
  5. V\u017edy kombinujte v\u00e1zac\u00ed prost\u0159edky s protiskluzov\u00fdmi podlo\u017ekami.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n\n

    V\u00e1\u0161, Sigurd Ehringer<\/p>\n\n

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    << P\u0159edchoz\u00ed p\u0159\u00edsp\u011bvekEpizoda 8: Form-fit v kontejneru<\/a><\/p>\n<\/div>\n\n\n\n

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    Next post >> Episode 10: Force closure<\/a><\/p>\n<\/div>\n<\/div>\n\n

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    Sigurd Ehringer<\/p>

    \u2714 VDI-zertifizierter Ausbilder f\u00fcr Ladungssicherung\r\n\u2714 Fachbuch-Autor\r\n\u2714 8 Jahre Projektmanager\r\n\u2714 12 Jahre bei der Bundeswehr (Kompaniechef)\r\n\u2714 20 Jahre Vertriebserfahrung\r\n\u2714 seit 1996 Berater\/Ausbilder in der Logistik\r\n\u2714 44 Jahre Ausbilder\/Trainer in verschiedenen Bereichen —>\r\n\r\nIn einer Reihe von Fachbeitr\u00e4gen aus der Praxis, zu Themen rund um den Container und LKW, erhalten Sie Profiwissen aus erster Hand. Wie sichert man Ladung korrekt und was sind die Grundlagen der Ladungssicherung?\r\nErarbeitet und vorgestellt werden sie von Sigurd Ehringer, Inhaber von SE-LogCon<\/a>.<\/p><\/div><\/div><\/div>\n\n\n\n

    <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    Zrychlen\u00ed je fyzik\u00e1ln\u00ed jev, kter\u00fd n\u00e1s neust\u00e1le obklopuje. \u010casto si to neuv\u011bdomujeme, a pokud ano, tak to bol\u00ed, nap\u0159. kdy\u017e si klepnete kladivem do palce. T\u00edmto blogem LaSi bych cht\u011bl ud\u011blat \u010d\u00e1ru od ka\u017edodenn\u00edch situac\u00ed ke speci\u00e1ln\u00edm po\u017eadavk\u016fm na p\u0159epravu n\u00e1mo\u0159n\u00edm kontejnerem nebo kamionem. V\u00fdpo\u010det zrychlen\u00ed Ve fyzice hovo\u0159\u00edme o rovnom\u011brn\u011b zrychlen\u00e9m p\u0159ekladu s po\u010d\u00e1te\u010dn\u00ed […]<\/p>\n","protected":false},"author":1536,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[864,866,865],"tags":[],"class_list":["post-680959","post","type-post","status-publish","format-standard","hentry","category-cargo-blog-cs","category-fyzicka-stranka","category-lorry"],"acf":[],"yoast_head":"\nZrychlen\u00ed - jak\u00e1 jsou nebezpe\u010d\u00ed? - Rothschenk<\/title>\n<meta name=\"description\" content=\"Technick\u00fd \u010dl\u00e1nek o zrychlen\u00ed expedice zbo\u017e\u00ed. 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