Siviele Tegnologie Aktiwiteit 8 (Bladsy 197)
1. Wet van momente ’n Stelsel van kragte is in ewewig wanneer die som van die linksom-momente om ’n draaipunt gelyk is aan die som van die regsom-momente om dieselfde draaipunt.
2.1 Ruimtediagram 2.2 Linker-reaksiekrag / reaksiekrag links 2.3 Regter-reaksiekrag / reaksiekrag regs 2.4 Steunpunt 2.5 Puntlaste 2.6 5 meter 2.7 9 kN 2.8 8 kN 3.1 RL = 6 N RR = 3 N 3.2 Toets:
Opwaartse krag = Afwaartse krag 6 N + 3 N = 9 N 9 N = 9N
Balk is dus in ewewig
4.1 RL = 10 N RR = 15 N 4.2 Toets:
Opwaartse krag = Afwaartse krag 10 N + 15 N = 25 N 25 N = 25N
5.1 RL = 90 N RR = 90 N 5.2 Toets:
Opwaartse krag = Afwaartse krag 90 N + 90 N = 30 N + 150 N 180 N = 180 N
Balk is dus in ewewig
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