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Summary Graad 12 Fisiese Wetenskappe (Kwartaal 2) - Ken en Verstaan

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Graad 12 Fisiese Wetenskappe opsommings (Kwartaal 2). Die opsommings is saamgestel deur die Ken en Verstaan handboek te gebruik. Opsommings is in Afrikaans met aanvullende en skriftelike notas wat deur die opsteller (eksterne party) saam gestel is. Inhoud van die opsommings: * Arbeid, energie en drywing. * Die Dopplereffek. * Tempo en omvang van reaksies. * Chemiese ewewig. Sure en basisse.

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Arbeid en energie
• Arbeid verrig op voorwerp
wanneer krag op die voorwerp
uitgeoefen word, en dit beweeg
in die rigting van krag. Netto arbeid gedoen
• W = F x ∆𝑥 x cos θ
• Arbeid – skalaar. • Meer as een krag terselfdertyd op 'n liggaam inwerk –
• SI-eenheid vir Arbeid – Newton- netto arbeid (Wnet) die arbeid wat die netto krag
meter genoem joule. verrig, dus Wnet= Fnet ∆x cos θ




Sample M1: E3:
Arbeid, energie
en drywing (A)

Summaries after sample
Gevalle waarin arbeid gedoen word of
nie gedoen word nie
Positiewe en Negatiewe arbeid
• Positiewe arbeid – F in bewegingsrigting – verhoog
sisteem se energie.
• Negatiewe arbeid - F in die teenoorgestelde rigting
van beweging - verminder sisteem se energie.
• Arbeid word slegs verrig wanneer krag op voorwerp inwerk • Kragte uitgeoefen reghoekig tot beweging of geen
en voorwerp in kragrigting beweeg. beweging – geen W gedoen nie.
• As krag uitgeoefen word teen 'n hoek met bewegingsrigting • Kragte uitgeoefen teen 'n hoek met
– slegs die komponent van krag parallel met bewegingsrigting – slegs F parallel met
bewegingsrigting werk wel. bewegingsrigting arbeid wel.
• Arbeid gedoen in die opheffing van voorwerpe: W = mg x h




GR12 FW K2-M1 Breinkaart Ken en Verstaan Kopiereg © www.summariessa.co.za (DO NOT COPY)

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