03.05.2013 Views

everything maths and science - C2B2A

everything maths and science - C2B2A

everything maths and science - C2B2A

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

sin(θ) = F4y<br />

F4<br />

sin(245 ◦ )= F4y<br />

2,5<br />

−3<br />

−2<br />

F4y = (sin(245 ◦ )) (2,5)<br />

= −2,27 N<br />

3<br />

2<br />

1<br />

−1<br />

−1<br />

F4<br />

−2<br />

−3<br />

Stap 6: Bereken die komponente van die resultant<br />

y<br />

1 2 3<br />

x<br />

Tweedens vind ons die grootte van<br />

die horisontale komponent, F4x:<br />

cos(θ) = F4x<br />

F4<br />

cos(245 ◦ )= F4x<br />

2,5<br />

F4x = (cos(245 ◦ )) (2,5)<br />

= −1,06 N<br />

Bereken die som van die verskeie komponente om die komponente van die resultant<br />

te bepaal. Onthou dat, indien ’n komponent negatief was, jy nie die negatiewe teken<br />

moet uitlaat uit jou berekening nie.<br />

Vektor x-komponent y-komponent Totaal<br />

F1 2,47 N 2,47 N 3,5 N<br />

F2 1,23 N 2,41 N 2,7 N<br />

F3 −0,78 N 1,04 N 1,3 N<br />

F4 −1,06 N −2,27 N 2,5 N<br />

R 1,86 N 3,65 N<br />

Noudat ons die komponente van die resultant het, kan ons Pythagoras se stelling gebruik<br />

om die grootte van die resultant, R, te bereken.<br />

R 2 =(Ry) 2 +(Rx) 2<br />

= (1,86) 2 + (3,65) 2<br />

= 16,78<br />

R = 4,10 N<br />

Hoofstuk 1. Vektore in twee dimensies<br />

49

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!