Предмет: Физика, автор: nastjakondratjeva224

Kuival murul soidab auto probleemideta,
kuid märial murul hakkavad rattad tihti
ringi käima. Miks?
2) Seisva vaguni laual lebavad körvuti pall
ja ajaleht. Kui rong likuma hakkab, veereb
pall tagasi, aga ajaleht ei liigu. Miks?
3) Kelk seisab lumisel mäel. Selleks et see
liikuma hakkaks, tuleb seda korraks
tõugata. Miks tuleb kelku likuma
hakkamiseks lükata ainult alguses, aga
pärast enam mitte?
4) Miks pannakse vahel talvel suurte
kaubaautode rehvidele peale ketid?

Ответы

Автор ответа: allo29212019
0

Відповідь:

  1. Kuna märjal murul on vähem haardumist kui kuival murul, siis rattad ei suuda saavutada piisavat haardumist ja hakkavad ringi käima.
  2. Pall on ümmargune ja ühtlane ning seega veereb see likumise ajal lihtsamini, samal ajal kui ajaleht ei ole piisavalt jäik, et vastu pidada rongi kiirendusele.
  3. Kelk seisab mäel raskusjõu mõjul. Alguses liigutades antakse kelgule kiirus ning see liigub edasi, kuni hõõrdejõudude ja raskusjõu tasakaal taas kehtestub.
  4. Kettide paigaldamine suurte kaubaautode rehvidele aitab suurendada nende haardumist lumisel ja jäisel teel. Ketid võivad pakkuda lisakokkupuudet teepinnaga ning takistada libisemist ja pidurdusmaadade pikendamist.
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