Mehlala e 3 ea lipotso tsa matla a khoheli
1. Ntho e na le boima ba 1 kg. Haeba lebelo le bakoang ke matla a khoheli = 10 m/s2, ntho eo e boima bo bokae?
Puisano
Hoa tsebahala :
Boima ba ntho (m) = 1 kg
Ho potlaka ka lebaka la matla a khoheli (g) = 10 m/s2
E botsitsoe Boima ba ntho (w)
Jawab :
Foromo ea matla a khoheli:
w = mg
Lintlha :
m = boima (yuniti ea machaba ke kilogram, kg e khutsufalitsoeng)
g = ho potlaka ka lebaka la matla a khoheli (diyuniti tsa machaba ke dimithara ka motsotsoana tse sekwere, tse kgutsufaditsweng m/s2)
w = matla a khoheli (diyuniti tsa machaba ke kg m/s2 (eo hape a tsejoang e le Newton)
Boima ba ntho ke:
w = (1 kg)(10 m/s2) = 10 kg m/s2 = 10 Newton
2. Sheba litšoantšo (a) le (b) ka tlase.
(a) Thala vekthara ya matla a khoheli ya ntho, setshwantshong sa (a).
(b) Thala vektara ya matla a khoheli, karolo ya vektara ya matla a khoheli e bapileng le sefofane se sekametseng le karolo ya vektara ya matla a khoheli e otlolohileng le sefofane se sekametseng, setshwantshong sa (b)!
Puisano
Tsela eo matla a khoheli a tsamaeang ka eona (w) e shebile tlase kapa e shebile bohareng ba lefatše.
wx = karolo e otlolohileng ea matla a khoheli le wy = karolo e otlolohileng ea matla a khoheli.
3. Haeba boima ba ntho = 1 kg mme lebelo le bakwang ke matla a kgoheli = 10 m/s 2 , fumana (a) boholo ba matla a kgoheli (b) boholo ba karolo ya vektara ya matla a kgoheli e bapileng le sefofane se sekametseng le boholo ba karolo ya vektara ya matla a kgoheli e otlolohileng le sefofane se sekametseng.
Puisano
Boholo ba matla a khoheli:
w = mg = (1 kg)(10 m/s2) = 10 kg m/s2 = 10 Newton
Boholo ba karolo ea matla a khoheli a bapileng le sefofane se sekametseng:
wx = sebe sa 30o = (10 N)(0,5) = 5 Newton
Boholo ba karolo ea matla a khoheli e otlolohileng ho ea sefofaneng se sekametseng:
Wy = w cos 30o = (10 N)(0,5√3) = 5√3 Li-Newton
[Senyesemane: Boima le boima – mathata le ditharollo ]
