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NATIONAL
SENIOR CERTIFICATE/
NASIONALE SENIOR
SERTIFIKAAT
GRADE/GRAAD 12
SEPTEMBER 2020
PHYSICAL SCIENCES P1/
FISIESE WETENSKAPPE V1
MARKING GUIDELINE/NASIENRIGLYN
MARKS/PUNTE: 150
This marking guideline consists of 18 pages./
Hierdie nasienriglyn bestaan uit 18 bladsye.
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Physical Sciences Grade 12 P1 Eastern Cape Mock 2020 Memo
Grade 12 Physical Sciences Paper 1 memorandum from the Eastern Cape Mock Exam 2020, 18 pages. Read online or download the free PDF.
Physical Sciences · Grade 12 · Eastern Cape Mock Exam · 2020. Memorandum, 18 pages. Read online or download the PDF.
- Subject
- Physical Sciences
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- Year
- 2020
- Exam period
- Eastern Cape Mock Exam
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- 1
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2 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
GENERAL GUIDELINES/ALGEMENE RIGLYNE
1. CALCULATIONS/BEREKENINGE
1.1 Marks will be awarded for: correct formula, correct substitution, correct
answer with unit.
Punte sal toegeken word vir: korrekte formule, korrekte substitusie, korrekte
antwoord met eenheid.
1.2 No marks will be awarded if an incorrect or inappropriate formula is used,
even though there are many relevant symbols and applicable substitutions.
Geen punte sal toegeken word waar ʼn verkeerde of ontoepaslike formule
gebruik word nie, selfs al is daar relevante simbole en relevante substitusies.
1.3 When an error is made during substitution into a correct formula, a mark
will be awarded for the correct formula and for the correct substitutions, but
no further marks will be given.
Wanneer ʼn fout gedurende substitusie in ʼn korrekte formule begaan word,
sal ʼn punt vir die korrekte formule en vir korrekte substitusies toegeken word,
maar geen verdere punte sal toegeken word nie.
1.4 If no formula is given, but all substitutions are correct, a candidate will
forfeit one mark.
Indien geen formule gegee is nie, maar al die substitusies is korrek,
verloor die kandidaat een punt.
1.5 No penalisation if zero substitutions are omitted in calculations where
correct formula/principle is correctly given.
Geen penalisering indien nulwaardes nie getoon word nie in berekeninge
waar die formule/beginsel korrek gegee is nie.
1.6 Mathematical manipulations and change of subject of appropriate formulae
carry no marks, but if a candidate starts off with the correct formula and then
changes the subject of the formula incorrectly, marks will be awarded for the
formula and correct substitutions. The mark for the incorrect numerical
answer is forfeited.
Wiskundige manipulasies en verandering van die onderwerp van toepaslike
formules tel geen punte nie, maar indien ʼn kandidaat met die korrekte formule
begin en dan die onderwerp van die formule verkeerd verander, sal die punte
vir die formule en korrekte substitusies toegeken word. Die punt vir die
verkeerde numeriese antwoord word verbeur.
1.7 Marks are only awarded for a formula if a calculation has been attempted,
i.e. substitutions have been made or a numerical answer given.
Punte word slegs vir ʼn formule toegeken indien ʼn poging tot berekening
aangewend is, d.w.s. substitusies is gedoen of ʼn numeriese antwoord is
gegee.
1.8 Marks can only be allocated for substitutions when values are substituted into
formulae and not when listed before a calculation starts.
Punte kan slegs toegeken word vir substitusies wanneer waardes in formules
ingestel word en nie vir waardes wat voor ʼn berekening gelys is nie.
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 3
1.9 All calculations, when not specified in the question, must be done to a
minimum of two decimal places.
Alle berekenings, wanneer nie in die vraag gespesifiseer word nie, moet tot ʼn
minimum van twee desimale plekke gedoen word.
1.10 If a final answer to a calculation is correct, full marks will not automatically be
awarded. Markers will always ensure that the correct/appropriate formula is
used and that workings, including substitutions, are correct.
Indien ʼn finale antwoord van ʼn berekening korrek is, sal volpunte nie
outomaties toegeken word nie. Nasieners sal altyd verseker dat die
korrekte/toepaslike formule gebruik word en dat bewerkings, insluitende
substitusies korrek is.
1.11 Questions where a series of calculations have to be made (e.g. a circuit
diagram question) do not necessarily always have to follow the same order.
FULL MARKS will be awarded provided it is a valid solution to the problem.
However, any calculation that will not bring the candidate closer to the answer
than the original data, will not count any marks.
Vrae waar ʼn reeks berekeninge gedoen moet word (bv. ʼn stroombaan-
diagramvraag) hoef nie noodwendig dieselfde volgorde te hê nie.
VOLPUNTE sal toegeken word op voorwaarde dat dit ʼn geldige oplossing vir
die probleem is. Enige berekening wat egter nie die kandidaat nader aan die
antwoord as die oorspronklike data bring nie, sal geen punte tel nie.
2. UNITS/EENHEDE
2.1 Candidates will only be penalised once for the repeated use of an incorrect unit
within a question.
Kandidate sal slegs een keer gepenaliseer word vir die herhaaldelike gebruik
van ʼn verkeerde eenheid in ʼn vraag.
2.2 Units are only required in the final answer to a calculation.
Eenhede word slegs in die finale antwoord op ʼn vraag verlang.
2.3 Marks are only awarded for an answer, and not for a unit per se. Candidates
will therefore forfeit the mark allocated for the answer in each of the following
situations:
Correct answer + wrong unit
Wrong answer + correct unit
Correct answer + no unit
Punte sal slegs vir ʼn antwoord en nie vir ʼn eenheid per se toegeken word nie.
Kandidate sal die punt vir die antwoord in die volgende gevalle verbeur:
Korrekte antwoord + verkeerde eenheid
Verkeerde antwoord + korrekte eenheid
Korrekte antwoord + geen eenheid
2.4 SI units must be used except in certain cases, e.g. V.m-1 instead of N.C-1, and
cm•s-1 or km•h-1 instead of m•s-1 where the question warrants this.
SI-eenhede moet gebruik word, behalwe in sekere gevalle, bv. V•m-1 in plaas
van N•C-1, en cm•s-1 of km•h-1 in plaas van m•s-1 waar die vraag dit regverdig.
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4 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
3. GENERAL/ALGEMEEN
3.1 If one answer or calculation is required, but two are given by the candidate,
only the first one will be marked, irrespective of which one is correct. If two
answers are required, only the first two will be marked, etc.
Indien een antwoord of berekening verlang word, maar twee word deur die
kandidaat gegee, sal slegs die eerste een nagesien word, ongeag watter een
korrek is. Indien twee antwoorde verlang word, sal slegs die eerste twee
nagesien word, ens.
3.2 For marking purposes, alternative symbols (s, u, t, etc.) will also be accepted.
Vir nasiendoeleindes sal alternatiewe simbole (s, u, t, ens.) ook aanvaar word.
3.3 Separate compound units with a multiplication dot, not a full stop, for example,
m•s-1. For marking purposes, m•s-1 and m/s will also be accepted.
Skei saamgestelde eenhede met ʼn vermenigvuldigingspunt en nie met ʼn punt
nie, byvoorbeeld m•s-1. Vir nasiendoeleindes sal m•s-1 en m/s ook aanvaar
word.
4. POSITIVE MARKING/POSITIEWE NASIEN
Positive marking regarding calculations will be followed in the following cases:
Positiewe nasien met betrekking tot berekeninge sal in die volgende gevalle geld:
4.1 Subquestion to subquestion: When a certain variable is calculated in one
subquestion (e.g. 3.1) and needs to be substituted in another (3.2 of 3.3), e.g.
if the answer for 3.1 is incorrect and is substituted correctly in 3.2 or 3.3, full
marks are to be awarded for the subsequent subquestions.
Subvraag na subvraag: Wanneer ʼn sekere veranderlike in een subvraag
(bv. 3.1) bereken word en dan in ʼn ander vervang moet word (3.2 of 3.3), bv.
indien die antwoord vir 3.1 verkeerd is en word korrek in 3.2 of 3.3 vervang,
word volpunte vir die daaropvolgende subvraag toegeken.
4.2 A multistep question the a subquestion: If the candidate has to calculate,
for example, current in die first step and gets it wrong due to a substitution error,
the mark for the substitution and the final answer will be forfeited.
ʼn Vraag met veelvuldige stappe in ʼn subvraag: Indien ʼn kandidaat bv. die
stroom verkeerd bereken in ʼn eerste stap as gevolg van ʼn substitusiefout,
verloor die kandidaat die punt vir die substitusie sowel as die finale antwoord.
5. NEGATIVE MARKING/NEGATIEWE NASIEN
Normally an incorrect answer cannot be correctly motivated if based on a conceptual
mistake. If the candidate is therefore required to motivate in QUESTION 3.2 the
answer given in QUESTION 3.1, and QUESTION 3.1 is incorrect, no marks can be
awarded for QUESTION 3.2. However, if the answer for e.g. QUESTION 3.1 is
based on a calculation, the motivation for the incorrect answer could be considered.
ʼn Verkeerde antwoord, indien dit op ʼn konsepsuele fout gebaseer is, kan normaalweg
nie korrek gemotiveer word nie. Indien ʼn kandidaat gevra word om in VRAAG 3.2 die
antwoord op VRAAG 3.1 te motiveer en VRAAG 3.1 is verkeerd, kan geen punte vir
VRAAG 3.2 toegeken word nie. Indien die antwoord op bv. VRAAG 3.1 egter op ʼn
berekening gebaseer is, kan die motivering vir die verkeerde antwoord in VRAAG 3.2
oorweeg word.
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 5
QUESTION/VRAAG 1: MULTIPLE-CHOICE QUESTIONS/
MEERVOUDIGEKEUSE-VRAE
1.1 C (2)
1.2 C (2)
1.3 A (2)
1.4 D (2)
1.5 A (2)
1.6 B (2)
1.7 D (2)
1.8 B (2)
1.9 D (2)
1.10 C (2)
[20]
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6 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
QUESTION/VRAAG 2
2.1 When a resultant/net force acts on an object, it accelerates in the direction of
the force. The acceleration is directly proportional to the force and inversely
proportional to the mass of the object.
Indien ʼn resulterende/netto krag op ʼn voorwerp inwerk, versnel die voorwerp in
die rigting van die krag. Die versnelling is direk eweredig aan die krag en
omgekeerde eweredig aan die massa van die voorwerp. (2)
2.2
OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
N
N T
T
f
f
W// W┴
W
(4)
Mark awarded for arrow and label. / Punt toegeken vir byskrif en pyltjie.
Do not penalise for length of arrows since drawing is not drawn to scale./
Moenie vir die lengte van die pyltjies penaliseer nie, aangesien die skets nie
volgens skaal geteken is nie.
3
Any other additional force(s) / Enige addisionele kragte
4
If force(s) do not make contact with body. / Indien die kragte nie kontak maak
3
met die voorwerp nie. Max./Maks.
4
2.3 OPTION 1 (To the right is OPTION 2 (To the right is negative)
positive) OPSIE 2 (Na regs is negatief)
OPSIE 1 (Na regs is positief)
Fnet = ma Fnet = ma
Fnet = 0 N Any one / Fnet = 0 N Any one /
Fg – T = ma Enige een T - Fg = ma Enige een
15 x 9,8 - T = 0 T – 15 x 9,8 = 0
T = 147 N T = 147 N
T – Wsin θ – f = ma Wsin θ + f – T = ma
T – mgsin θ – f = ma mgsin θ + f – T = ma
147– 22 x 9,8sin θ – 43,86 = 0 22 x 9,8 sin θ + 43,86 – 147 = 0
θ = 28,58° θ = 28,58° (4)
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 7
2.4 2.4.1 The kinetic friction force depends on the angle of the inclined to the
horizontal and nature of the surface.
Die kinetiese wrywingskrag is afhanklik van die hoek van die skuinsvlak
met die horisontaal en die aard van die oppervlakte. (2)
2.4.2 Positive marking from Question 2.3 / Marking criteria / Merk kriteria
Merk positier vanaf Vraag 2.3
For 15 kg block / Vir 15 kg-blok Fnet = ma
Fnet = ma F - Fg – T = ma
F - Fg – T = ma T + Wsin θ – f = ma Any one /
172 – 147 – T = 15a …(1) Enige een
T + mgsin θ – f = ma
Calculating Fg//
For 22 kg block / Vir 22 kg-blok Berekening van Fg//
T + W sinθ– f = ma Substitution for the 15 kg block
T + mg sinθ– f = ma Instelling vir die 15 kg-blok
[T + 22 x 9,8 sin 28,58o – 43,86] = Substitution for the 22 kg block
22a Instelling vir die 22 kg-blok
[T + 101,14 – 43,86] = 22a (2) Substitution for either 15a or 22a
Instelling vir 15a of 22a
∴ a = 2,278 m.s-2 Answer/Antwoord (6)
[18]
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8 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
QUESTION/VRAAG 3
3.1 UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
vf = vi + a∆t vf = vi + a∆t
vf = -3,28 + (-9,8) x 1,2 vf = 3,28 + (9,8) x 1,2
vf = - 15,04 vf = 15,04 m.s-1 downwards/afwaarts
vf = 15,04 m.s-1 downwards/afwaarts (3)
3.2 OPTION/OPSIE 1
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
1 1
∆y = vi ∆t + a∆t2 ∆y = vi∆t+ a∆t2
2 2
1 1
∆𝑦 = -3,28 x 1,2 + (-9,8)1,22 ∆y = 3,28 x 1,2 + (9,8)1,22
2 2
∆y = -10,99 ∆𝑦 = 10,99 m downwards/afwaarts
∆y = 10,99 m downwards/afwaarts
OPTION /OPSIE 2
Positive marking from Question 3.1/Positiewe merk vanaf Vraag 3.1
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
vf = vi + 2a∆y
2 2
vf2 = vi2 + 2a∆𝑦
-15,04 = -3,28 + 2 (-9,8) ∆y
2 2
15,042 = 3,282 + 2 (9,8) ∆y
∆y = 10,99 m downwards/afwaarts ∆y= 10,99 m downwards/afwaarts
OPTION/OPSIE 3
Positive marking from Question 3.1/Positiewe merk vanaf Vraag 3.1
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
v vi v vi
∆y = f Δt ∆y = f Δt
2 2
-15,04 + ( 3,28) 15,04 + 3,28
∆y = x 1,2 ∆y = x 1,2
2 2
∆y = -10,99 m ∆y = 10,99 m downwards/afwaarts
∆y = 10,99 m downwards/afwaarts (4)
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 9
3.3 OPTION 1/OPSIE 1
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
vf2= vi2 + 2a∆y vf2= vi2 + 2a∆y
vf2= -3,282 + 2 (-9,8) (30) vf2= 3,282 + 2 (9,8) (30)
vf2= - 24,47 m.s-1 vf2= 24,47 m.s-1 downwards/afwaarts
vf2= 24,47 m.s-1 downwards/afwaarts
OPTION 2/OPSIE 2
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
1 1
∆y = vi∆t+ a∆t2 ∆y = vi∆t+ a∆t2
2 2
1 1
-30 = -3,28∆𝑡 + (-9,8)∆𝑡 2 30 = 3,28∆𝑡 + (9,8)∆𝑡 2
2 2
∆𝑡 = 2,16 s ∆t = 2,16 s
vf = vi + a∆t vf = vi + a∆t
vf = -3,28 + (-9,8)(2,16) vf = 3,28 + (9,8)(2,16)
vf= -24,45 m.s-1 vf = 24,45 m.s-1 downwards/afwaarts
vf = 24,45 m.s-1 downwards/afwaarts (3)
3.4 Positive marking from Question 3.2/Positiewe merk vanaf Vraag 3.2
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
Fnet.∆t = m(vf - vi) Fnet. ∆t = m(vf - vi)
205 x 0,1 = 0,5 [𝑣𝑓 – (- 24,47)] -205 x 0,1 = 0,5 (vf– 24,47)]
vf= 16,53 m.s upwards/opwaarts
-1 vf= -16,53 m.s-1
vf = 16,53 m.s-1 upwards/opwaarts (4)
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10 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
3.5 OPTION 1/OPSIE 1
Positive marking from Question 3.1 and 3.3
Positiewe merk vanaf Vraag 3.1en 3.3
UPWARD POSITIVE UPWARD NEGATIVE
OPWAARTS POSITIEF OPWAARTS NEGATIEF
vf = vi + 2a∆y
2 2
vf2= vi2 + 2a∆y
0 = 16,53 + 2 (-9,8) ∆y
2 2
02 = -16,532 + 2 (9,8) ∆y
∆y = 13,94 m ∆y = - 13,94 m
width of window / wydte van venster width of window / wydte van venster
= 30 – (10,99+13,94) = 30 – (10,99 +13,94)
= 5,07 m = 5,07 m
OPTION 2/OPSIE 2
Wnet = ∆Ek
Fnet ∆y cos θ = ∆Ek Any one/Enige een
1 1
Fg∆y cos θ = mvf2 - mvi2
2 2
1
4,9 ∆ycos 180o = 0 - x 0,5 x 16,532
2
∆y = 13,94 m
width of window / wydte van venster
= 30 – (10,99 + 13,94)
= 5,07 m (5)
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 11
QUESTION/VRAAG 4
4.1 In an isolated system total linear momentum is conserved.
In ʼn geïsoleerde sisteem bly die totale lineêre momentum behoue. (2)
4.2 4.2.1 MEi = MEf
mgh1 + ½ mvi2 = mgh2 + ½ mvf2
0 + ½ x 2,005 x vi2 = 2,005 x 9,8 x 0,06 + 0
vi = 1,08 m.s-1
∑pi = ∑pf
Any one/Enige een
mblockviblock + mbulletvibullet = (mblock + mbullet) vf
0 + 0,005 x vibullet = 2,005 x 1,08
vbullet = 433,08 m.s-1 right/regs (5)
4.2.2 Positive marking from Question 4.2.1/Positiewe merk vanaf
Vraag 4.2.1
∑pi = ∑pf
(mgun + mbullet)vi = mgunvfgun + mbulletvfbullet = Any one/Enige een
0 = 5 x vf(gun)+ 0,005 x 433,08
vf(gun= - 0,43 m.s-1
vf(gun = 0,43 m.s-1 left/links (3)
[10]
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12 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
QUESTION/VRAAG 5
5.1 In an isolated system the total mechanical energy is conserved.
In ’n geïsoleerde sisteem bly die totale meganiese energie behoue. (2)
5.2 MEi = MEf
(Ep + Ek)A = (Ep + Ek)B Any one/Enige een
mgh1 + Ek(A) = mgh2 + Ek(B)
55 x 9,8 x 15 + 0 = 0 + Ek(B)
Ek(B) = 8085 J (3)
5.3 The net work done on an object is equal to the object’s change in kinetic
energy.
OR
The work done by a net force is equal to the object’s change in kinetic energy.
Die netto arbeid verrig op ʼn voorwerp is gelyk aan die voorwerp se verandering
in kinetiese energie.
OF
Die arbeid verrig deur ʼn netto krag is gelyk aan die voorwerp se verandering in
kinetiese energie. (2)
5.4 5.4.1 Positive marking from Question 5.2/Positiewe merk vanaf Vraag 5.2
OPTION 1/OPSIE 1
Wner = ∆Ek
Wf + WFg// = ∆Ek Any one/Enige een
f x ∆x cos θ + mgsin θ ∆x cos θ = ∆Ek
15 x 10 cos180o + 55 x 9,8 sin 15o x 10 cos 180o = 0 – Eki
Eki = 1545,035 J
OPTION 2/OPSIE 2
Wnc = ∆Ek + ∆Ep
Wf = ∆Ek + ∆Ep Any one/Enige een
f x ∆x cos θ = ∆Ep + ∆Ek
15 x 10 cos180o = [55 x 9,8 x (10 sin15o)] - 0 + 0 - Eki
-150 = 1395,035 - Eki
Eki = 1545,035 J
OPTION 3/OPSIE 3
Wner = ∆Ek
Wf + WFg = ∆Ek Any one/Enige een
f x ∆x cos θ + mg ∆xcos θ = ∆Ek
15 x 10 cos180o + 55 x 9,8 x 10 cos (90 + 15) = 0 – Eki
Eki = 1545,035 J (4)
5.4.2 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
Wnet = ∆Ek Wnc = ∆Ek + ∆Ep
Wf = ∆Ek Any one/Enige een Wf = ∆Ek + ∆Ep Any one/
f x ∆x cos θ = ∆Ek f x ∆x cos θ = ∆Ek + ∆Ep Enige een
f x 10 cos180o = 1545,035 - 8085 f x 10 cos180o = 1545,035
654,00 N - 8085
f = 654,00 N (5)
[16]
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 13
QUESTION/VRAAG 6
6.1 Doppler effect/Doppler effek (1)
6.2 AWAY. The observed frequency is less than the source frequency.
WEG VAN. Die waargenome frekwensie is minder as die bron se
frekwensie. (2)
6.3 As the listener’s velocity increases, the observed frequency decreases.
As die luisteraar se snelheid toeneem, verminder die waargenome
frewensie. (2)
6.4 The intercept on the vertical axis represents the frequency of the source, fs.
Die afsnit op die vertikale as verteenwoordig die frekwensie van die bron, fs. (2)
6.5 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
492 470 v ± vL
Gradient/Helling = fL = fs
5 20 v ± vs
22 340 15
= 492 = x fs
15 340
f fs = 499,34 Hz
= - s
v
22 fs
= -
15 340
fs = 498,67 Hz
OPTION 3/OPSIE 3
v ± vL
fL = fs
v ± vs
340 15
470 = x fs
340
fs = 499,38 Hz
Range (498,67 Hz – 499,38 Hz) (5)
6.6 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2 OPTION 3/OPSIE 3
v = fλ v = fλ v = fλ
340 = 498,67 λ 340 = 499,34 λ 340 = 499,38 λ
𝜆 = 0,68 m 𝜆 = 0,68 m 𝜆 = 0,68 m
The wavelength The wavelength produced The wavelength
produced by the tuning by the tuning fork is less produced by the tuning
fork is less than the than the required fork is less than the
required wavelength. wavelength. required wavelength.
∴ It is not suitable. ∴ It is not suitable. ∴ It is not suitable.
Die golflengte wat Die golflengte wat Die golflengte wat
voortgeplant word deur voortgeplant word deur die voortgeplant word deur
die stemvurk is minder stemvurk is minder as die die stemvurk is minder as
as die benodigde benodigde golflengte. die benodigde golflengte.
golflengte. ∴ Dit is nie geskik nie.
∴ Dit is nie geskik nie. ∴ Dit is nie geskik nie. (3)
[15]
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14 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
QUESTION/VRAAG 7
7.1 Q
n=
qe
2 x 106
n=
1,6 x1019
n = 1,25 x 1013 (3)
7.2
Criteria for marking/Kriteria vir merk
Correct shape / Korrekte vorm
Direction of electric field / Rigting van elektriese veld
Lines not crossing each other / Lyne sny nie mekaar nie. (3)
7.3 7.3.1 vf = vi + a∆t
6,25 x 103 = 0 + 2 x 10-3 a Any one /Enige een
a = 3,125 x 106 m.s-2
Fnet = ma
Fnet = 5 x 10-6 x 3,125 x 106
Fnet = 15,625 N
Fnet
Enet =
q
15,625
Enet =
2 x10 6
Enet = 7,81 x 106 N.C-1 (6)
7.3.2 Positive marking from Question 7.3.1/Positiewe merk vanaf Vraag 7.3.1
OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
kQ vf 2 = vi2 + 2a Δx
E= 2
r (6,25 x 103)2 = 02 + 2(3,125 x 106)Δx
9 x109 x 2 x 106 Δx = 6,25 m
7,81 x 106 = 2
r
∴ r = 4,80 x 10-2 m
Using equations of motion / Gebruik van bewegingsvergelykings
OPTION 3/OPSIE 3 OPTION/OPSIE 4
Δx = ½(vf + vi) Δt Δx = vi Δt + ½ a Δt²
= ½(6,25 x 103+ 0)(2 x 10-3) = 0 + ½(3,125 x 106)(2 x 10-3)²
Δx = 6,25 m Δx = 6,25 m (3)
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 15
7.3.3 Positive marking from Question 7.3.1 and 7.3.2
Positiewe merk vanaf Vraag 7.3.1en 7.3.2
OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
kQ1Q2 kQ1Q2
FE = 2
FE =
r r2
9 x109 x Q x 2 x 10 6 15,625 = (9 x 109)(Q1)(2 x 10-6)
15,625 = 6,25²
4,80 x 102
2
∴ Q = 3,39 x 10-2 C
∴ Q = 2,00 x 10-6 C (4)
[19]
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16 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
QUESTION/VRAAG 8
8.1 Resistance/Weerstand (1)
8.2 8.2.1 4,2
0,2
Gradient/Helling =
24 0
1
=
6
1
=
emf
1 1
=
emf 6
∴ emf = 6 V (4)
8.2.2 Positive marking from Question 8.2.1/Positiewe merk vanaf Vraag
8.2.1
OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
r 𝜀 = I (R + r )
Intercept on vertical axis =
emf 1
6= (24 + r )
r 4,2
0,2 =
emf r = 1,2 Ω
r
0,2 =
6
r = 1,2 Ω (3)
8.3 8.3.1 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
P = VI V2
P=
3 = I x 1,5 R
I=2A 1,5 2
3=
R
R = 0,75 Ω
P = I2 R
3 = I2 x 0,75
I=2A (3)
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(EC/SEPTEMBER 2020) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 17
8.3.2 Positive marking from Question 8.2.1en 8.2.2
Positiewe merk vanaf Vraag 8.2.1en 8.2.2
OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
V2 V2
P= P=
R toy car R toy car
1,52 1,52
3= 3=
R toy car R toy car
Rtoy car = 0,75 Ω Rtoy car = 0,75 Ω
emf = I (Rext + r ) emf = I (Rext + r)
6 = 2 (Rext + 1,2) 6 = 2 (Rext + 1,2)
Rext = 1,8 Ω Rext = 1,8 Ω
Rext = Rtoy car + Rp Rext = Rtoy car + Rp
1,8 = 0,75 + Rp 1,8 = 0,75 + Rp
Rp = 1,05 Ω Rp = 1,05 Ω
1 1 1 R1 R2
= + Rp =
Rp R1 R2 R1 +R2
1 1 1 3x R
= + 1,05 =
1,05 3 R 3 +R
R = 1,62 Ω R = 1,62 Ω (6)
8.4 No, the external resistance will increase. Current will decrease.
P = I2R, P 𝛼 I2 since resistance remain constant, power will decrease.
Nee, die eksterne weerstand sal toeneem. Stroom sal afneem.
P = I2R, P 𝛼 I2 aangesien die weerstand constant bly sal die drywing afneem. (3)
[20]
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18 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2020)
QUESTION/VRAAG 9
9.1 (Electric) motor/ (Elektriese) motor (1)
9.2 Electrical energy to mechanical energy
Elektriese energie na meganiese energie (2)
9.3 CLOCKWISE / KLOKSGEWYS (1)
9.4 Replace the split ring with slip rings.
Replace the cell with a resistor / ammeter / voltmeter.
Vervang die split ring met sleepringe
Vervang die sel met ‘n resistor / ammeter / voltmeter. (2)
2
9.5 9.5.1 Vrms
Paverage
R
2302
1500=
R
R = 35,27 Ω (3)
9.5.2 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
V Paverage = VrmsIrms
R = rms 1 500 = Irms x 230
Irms
Irms = 6,52 A
2302 I
35,27 =
Irms Irms = max
2
Irms = 6,52 A 𝐼𝑚𝑎𝑥
6,52 =
Imax √2
Irms = 𝐼𝑚𝑎𝑥 = 9,22 A
2
Imax
6,52 =
2
Imax = 9,22 A (4)
[13]
TOTAL/TOTAAL: 150
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