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Otkrivamo silu
trenja
„Ledena priča”
 Ovim projektom otkrivamo zašto
bi nam život bio nemoguć bez
trenja…
Podovi, ceste i pločnici bili bi skliskiji nego
ledeno klizalište. Ljudi bi padali na pod
kada bi pokušali hodati ili trčati. Automobili
ne bi mogli ubrzavati ni kočiti.
 Da bismo otkrili o čemu ovisi trenje,
upotrijebili smo pribor za pokuse.
Kroz prvi pokus otkrivamo ovisi li trenje o veličini
plohe.
 Sila trenja ne ovisi o veličini dodirne plohe tijela
i podloge.
U drugom pokusu otkrivamo ovisi li trenje
o pritisnoj sili.
Sila trenja ovisi o pritisnoj sili.
Kvadar G/N F/N F/G
1 1.4 0.3 0.2
2 2.8 0.6 0.2
U trećem pokusu provjeravamo ovisnost
kakvoće plohe i sile trenja.
Trenje ovisi o kemijskom sastavu i
hrapavosti dodirnih površina.
Zaključak
Otkrili smo da je trenje sila kojom se
površina (na kojoj tijelo miruje ili po kojoj
se giba) opire gibanju ili otpor sredstva
kroz koje se tijelo giba, a ovisi o
koeficijentu trenja i pritisnoj sili
 𝐹𝑇𝑅= μ·𝐹𝑃

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Otkrivamo silu trenja

  • 2.  Ovim projektom otkrivamo zašto bi nam život bio nemoguć bez trenja… Podovi, ceste i pločnici bili bi skliskiji nego ledeno klizalište. Ljudi bi padali na pod kada bi pokušali hodati ili trčati. Automobili ne bi mogli ubrzavati ni kočiti.
  • 3.  Da bismo otkrili o čemu ovisi trenje, upotrijebili smo pribor za pokuse.
  • 4. Kroz prvi pokus otkrivamo ovisi li trenje o veličini plohe.  Sila trenja ne ovisi o veličini dodirne plohe tijela i podloge.
  • 5. U drugom pokusu otkrivamo ovisi li trenje o pritisnoj sili. Sila trenja ovisi o pritisnoj sili. Kvadar G/N F/N F/G 1 1.4 0.3 0.2 2 2.8 0.6 0.2
  • 6. U trećem pokusu provjeravamo ovisnost kakvoće plohe i sile trenja. Trenje ovisi o kemijskom sastavu i hrapavosti dodirnih površina.
  • 7. Zaključak Otkrili smo da je trenje sila kojom se površina (na kojoj tijelo miruje ili po kojoj se giba) opire gibanju ili otpor sredstva kroz koje se tijelo giba, a ovisi o koeficijentu trenja i pritisnoj sili  𝐹𝑇𝑅= μ·𝐹𝑃