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Aktiwiteit 4 n Seun met ' n massa van 40 kg hardloop teen \( 5 \mathrm{~ms}^{-2} \) oos en spring op 'n skaatsplank met massa 2 kg wat oos beweeg teen \( 3 \mathrm{~ms}^{-1} \). Bereken die spoed waarteen die seun en skoatsplank saam beveeg

Ask by Stuart Powers. in South Africa
Jan 23,2025

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Die seun en die skaatsplank beweeg saam met 'n spoed van ongeveer 4.90 m/s oos.

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Om die finale spoed waarteen die seun en die skaafplank saam beweeg te bereken, kan ons die bewaring van momentum wet toepas. Die totale momentum voor die seun op die skaafplank spring, is gelyk aan die totale momentum nadat hulle saam beweeg. **Voorbeeld van momentum berekening:** Die momentum van die seun is \( p_{seun} = m_{seun} \times v_{seun} = 40 \, \text{kg} \times 5 \, \text{ms}^{-1} = 200 \, \text{kg} \cdot \text{ms}^{-1} \). Die momentum van die skaafplank is \( p_{plank} = m_{plank} \times v_{plank} = 2 \, \text{kg} \times 3 \, \text{ms}^{-1} = 6 \, \text{kg} \cdot \text{ms}^{-1} \). Die totale momentum voor hulle saam beweeg is \( 200 + 6 = 206 \, \text{kg} \cdot \text{ms}^{-1} \). Na die seun en die plank saam beweeg, laat ons die finale spoed \( v_f \) sê. Die totale massa is 40 + 2 = 42 kg. Die momentum na hulle saam beweeg is \( p_{totaal} = (m_{seun} + m_{plank}) \times v_f \). Dit gee ons die vergelyking \( 206 = 42 \times v_f \). Solving vir \( v_f \) gee ons \( v_f = \frac{206}{42} \approx 4.90 \, \text{ms}^{-1} \). **Fun Fact:** Wist jy dat momentum in die fisika die sleutel rol speel in die ontwerp van motors en sporttoestande? Ingenieurs gebruik momentum om die veiligheid van voertuie te verbeter, en dit help atlete om hul prestasies te optimaliseer, wat beteken dat dit nie net vir wiskunde is nie, maar ook vir die werklike wêreld! **Probleemoplossing Gids:** Blaas jou gedagtes uit kaakvaster vir momentum berekeninge! Maak seker jy hou rekords van die rigtings van die bewegings en lees altyd die eenhede. 'n Algemene fout is om die rigting van die beweging te ignoreer. Vergewis jouself daarvan dat momentum 'n vektor is, wat beteken dat rigting gelukkig moet saam met die waardes neem.

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