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Samenvatting Fysica

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Het gaat over elke deel dat we zien in het eerste jaar Fysica. Er is een deel over foutenleer, materie en energie (aggregatietoestanden, dichtheid, warmte...), over faseovergangen, gassen, vloeistoffen, oplossingen en dan nog de delen over elektriciteit, elektroforese en elektrochemie. Ook staan alle theoretische vragen in het document, die we tijdens de lessen hebben gezien

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Samenvatting Fysica



Deel 1: foutenleer

Afleesfout:

Bovenweger
Voor niet analytische stoffen
Massa = 12,08 g → 12,085 g < m > 12,075 g
12,08 g +- 0,005 g
Kleinste verdeling meettoestel = 0,01 g dus de helft is 0,005 g

Meetfout:

= Absolute fout = AF
= Het maximale verschil tussen gemeten waarde en
werkelijke waarde

• Absolute fout = 2x afleesfout = kleinste verdeling
• Uitzonderingen: afwijkende AF op toestel
weergegeven door fabrikant

Balpen meten met een meetlat
2 keer afleesfout vanvoor en vanachter
Bv. 14 cm
AF = 0,1 cm
→ 0,1 cm . 2 = 0,2 cm

Gegradueerde pipetten
AF = 0,1 mL
De fabrikant heeft erop vermeld dat er maar een AF is van 0,05 mL en 0,060 mL
1. Extra mechanische speling
2. Nulpunt is absoluut nulpunt → je maakt maar 1 fout

Beduidende en niet-beduidende cijfers:

Beduidend = werkelijk aflezen op meettoestel
Nullen links zijn niet beduidend

Bv. 95 heeft 2 beduidende cijfers
0,7 → 1BC
0,70 → 2BC

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