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NATIONAL
SENIOR CERTIFICATE/
NASIONALE SENIOR
SERTIFIKAAT
GRADE/GRAAD 12
SEPTEMBER 2019
PHYSICAL SCIENCES P1/
FISIESE WETENSKAPPE V1
MARKING GUIDELINE/NASIENRIGLYN
MARKS/PUNTE: 150
This marking guideline consists of 17 pages./
Hierdie nasienriglyn bestaan uit 17 bladsye.
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Physical Sciences Grade 12 P1 Eastern Cape Mock 2019 Memo
Grade 12 Physical Sciences Paper 1 memorandum from the Eastern Cape Mock Exam 2019, 17 pages. Read online or download the free PDF.
Physical Sciences · Grade 12 · Eastern Cape Mock Exam · 2019. Memorandum, 17 pages. Read online or download the PDF.
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- Physical Sciences
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- Memorandum
- Year
- 2019
- Exam period
- Eastern Cape Mock Exam
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- 1
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2 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
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 2019) 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 2019)
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 Sub-question to sub-question: When a certain variable is calculated in one
sub-question (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 sub-questions.
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 sub-question: 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 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 5
QUESTION/VRAAG 1: MULTIPLE-CHOICE QUESTIONS/
MEERVOUDIGEKEUSE-VRAE
1.1 C (2)
1.2 A (2)
1.3 B (2)
1.4 C (2)
1.5 D (2)
1.6 A (2)
1.7 D (2)
1.8 B (2)
1.9 A (2)
1.10 D (2)
[20]
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6 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
QUESTION/VRAAG 2
2.1 A body will remain at rest or motion with constant velocity unless a non-zero
resultant/net force acts on it.
'n Liggaam sal in sy toestand van rus of beweging teen konstante snelheid bly
tensy 'n nie-nul resulterende/netto krag daarop inwerk.
OR/ OF
An object will continue in a state of rest or uniform velocity, unless it is acted
upon by an unbalanced force.
ʼn Liggaam sal in sy toestand van rus of uniforme beweging volhard tensy 'n
ongebalanseerde (resulterende/netto) krag daarop inwerk. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
2.2 OPTION 1/ OPSIE 1 OPTION 2/ OPSIE 2
N
Fapp
N
Fap
p
f T f T
W W
(5)
Accept if learners draw the components of the applied force.
Aanvaar as leerders die komponente van toegepaste krag teken.
Mark awarded for arrow and label.
Punt word 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 skets nie na
skaal geteken is nie.
4
Any other additional force(s) / Enige addisionele kragte
5
4
If force(s) do not make contact with body. Max.
5
4
Indien krag(te) nie met die voorwerp kontak maak nie. Maks.
5
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(EC/SEPTEMBER 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 7
2.3 OPTION 1 (To the right is positive) OPTION 2 (To the right is negative)
OPSIE 1 (Neem regs as positief) OPSIE 2 (Neem links as negatief)
Fnet = ma Fnet = ma
Fnet = 0 N Any one/Enige een Fnet = 0 N Any one/Enige een
Fg – T = ma T - Fg = ma
12 kg mass 12 kg mass
12 x 9,8 – T = 0 T – 12 x 9,8 = 0
T = 117,6 N T = 117,6 N
m kg mass m kg mass
T – Fcosθ – f = ma Fcosθ + f – T= ma
117,6 – 88 cosθ – 32 = 0 88 cosθ + 32 – 117,6 = 0
θ = 13,41o θ = 13,41o (5)
2.4 Positive marking from 2.3/ Postiewe nasien vanaf 2.3
fk = μ k N
32 = (0,12) N Any one/ Enige een
N = 266,67 N
N = mg – Fsinθ
266,67 = m x 9,8 – 88 sin13,41o
m = 29,29 kg (4)
2.5 Remains the same
Bly dieselfde (1)
[17]
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8 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
QUESTION/VRAAG 3
3.1 3.1.1 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
UPWARD POSITIVE/ UPWARD NEGATIVE/
OPWAARTS AS POSITIEF OPWAARTS AS NEGATIEF
v f v i 2gy v f v i 2gy
2 2 2 2
0 v i 2 ( 9, 8 )( 2 ) 0 v i 2 ( 9, 8 )( 2 )
2 2
vi = 6,26 m.s-1 upwards/opwaarts vi = 6,26 m.s-1
upwards/opwaarts (4)
3.1.2 OPTION 1/ OPSIE 1 OPTION 2/ OPSIE 2
UPWARD POSITIVE/ UPWARD NEGATIVE/
OPWAARTS AS POSITIEF OPWAARTS AS NEGATIEF
∆y = vi∆t + ½ g∆t2 ∆y = vi∆t + ½ g∆t2
= 24 x 1,5 + ½ (-9,8)1,52 = -24 x 1,5 + ½ (9,8)1,52
= 24,98 m = 24,98 m
OPTION 3/OPSIE 3 OPTION 4/ OPSIE 4
UPWARD POSITIVE/ UPWARD NEGATIVE/
OPWAARTS AS POSITIEF OPWAARTS AS NEGATIEF
vf = vi + g∆t vf = vi + g∆t
= 24 + (-9,8)(1,5) = -24 + (9,8)(1,5)
vf = 9,3 m.s-1 vf = - 9,3 m.s-1
vf vi vf vi
y t y t
2 2
9, 3 2 4 9, 3 ( 2 4 )
y x 1, 5 y x 1, 5
2 2
∆y = 24,98 m ∆y = - 24,98 m
∆y = 24,98 m,
(upwards/opwaarts) (4)
3.2 Positive marking from 3.1.1/ Positiewe nasien vanaf 3.1.1
OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
UPWARD POSITIVE/ UPWARD NEGATIVE/
OPWAARTS AS POSITIEF AFWAARTS AS NEGATIEF
vf = vi + g∆t vf = vi + g∆t
= 24 + (-9,8)(1,5) = -24 + (9,8)(1,5)
vf = 9,3 m.s-1 vf = -9,3 m.s-1
v f v i 2gy v f v i 2gy
2 2 2 2
6,262 = 9,32 + 2(-9,8) ∆y (-6,26)2 = (-9,3)2 + 2(9,8) ∆y
∆y = 2,41 m ∆y = -2,41 m
Height/Hoogte = 24,98 + 2,41 Height/Hoogte = -24,98 + (-2,41)
Height/Hoogte = 27,39 m Height/Hoogte = -27,39 m
Height/Hoogte = 27,39 m,
(upwards/opwaarts) (6)
[14]
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(EC/SEPTEMBER 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 9
QUESTION/VRAAG 4
4.1 In an isolated system total linear momentum is conserved.
In 'n geïsoleerde sisteem bly die totale liniêre momentum konstant. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
4.2 EAST IS POSITIVE/ OOS IS POSITIEF
∑pi = ∑pf
mAviA + mBviB = mAvfA + mBvfB Any one/ Enige een
mAviA + mBviB = (mA + mB)vf
52,5 x viA + 42 x -4 = 0
viA = 3,2 m.s-1, right/regs (4)
4.3 670 N west/wes (No mark if only magnitude is given / Geen punt as slegs
grootte gegee word nie.) (1)
4.4 Fnet ∆t = ∆p
Any one/Enige een
Fnet ∆t = mvf - mvi
670 x 0,5 = 42 (vf – 0)
vf = 7,98 m.s-1 (4)
[11]
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10 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
QUESTION/VRAAG 5
5.1 In an isolated system the total mechanical energy remains constant.
In 'n geïsoleerde sisteem bly die totale meganiese energy konstant. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct
1 mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
5.2 WFg = - Ep
Any one/ Enige een
WFg = - mg (h2 – h1)
WFg = -1,5 x 9,8 (0 – 3)
WFg = 44,1 J (3)
5.3 A force is non-conservative if the work it does on an object which is moving
between two points depends on the path taken.
Is 'n krag waarvoor die arbeid verrig om 'n voorwerp tussen twee punte te
beweeg, afhanklik is van die roete wat gevolg word. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af
5.4 Positive marking from 5.2/ Positiewe nasien vanaf 5.2
OPTION 1/ OPSIE 1 OPTION 2/ OPSIE 2
W nc E k E p W net E k
W f Ek Ep W n e t E k f ( C ra te ) E k i ( C ra te )
1 1 1 2 1 2
W net mvf
2 2
Wf mvf m v i m g h 2 m g h1 m vi
2 2 2 2
E k i ( C ra te ) E p ( B a ll ) E k i ( C ra te ) E p ( B a ll )
= 44,1 J = 44,1 J
1 1
Wf = (1,5)(6,2)2 – 44,1 + 0 Wnet = (1,5)(6,2)2 – 44,1
2 2
Wf = - 15,27 J Wnet = 28,83 – 44,1
Wnet = - 15,27 J (But W net = W f)
Wf = - 15,27 J
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(EC/SEPTEMBER 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 11
OPTION 3/ OPSIE 3
METop = MEBottom
(Ek + Ep)Top = (Ek + Ep)Bottom
1 1
( mv2 + mgh)Top = ( mv2 + mgh)Bottom
2 2
1
(0 + 44,1) = ( x1,5xv2 + 0)
2
v = 7,67 m.s-1
W net E k
1 1
Wnet = (1,5)(6,2)2 – (1,5)(7,67)2
2 2
Wf = 28,83 – 44,12
Wf = - 15,29 J (5)
[12]
QUESTION/VRAAG 6
6.1 The change in frequency (or pitch), of the sound detected by a listener
because the sound source and the listener have different velocities relative to
the medium of sound propagation.
Dit is die verandering in frekwensie (of toonhoogte) van die klank
waargeneem deur 'n luisteraar omdat die klankbron en die luisteraar
verskillende snelhede relatief tot die medium van klankvoortplanting het.
OR/OF
An (apparent) change in observed/detected frequency (pitch), as a result of
the relative motion between a source and an observer.
'n (Skynbare) verandering in waargenome frekwensie (toonhoogte), as gevolg
van die relatiewe beweging tussen die bron en 'n waarnemer / luisteraar. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
6.2 871 Hz (1)
6.3 As the learner stands next to the sound source, the detector registers the
frequency of the source because there is no relative motion. As the learner
moves away from the source the waves become stretched out, the
wavelength become longer and the frequency become lower.
Soos die leerder langs die klankbron staan, registreer die detektor die
frekwensie van die bron omdat daar geen relatiewe beweging is nie. Soos
die leerder wegbeweeg van die bron, word die golwe uitgerek, die
golflengte word langer en die frekwensie word laer. (3)
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12 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
6.4 x
v
t
110 94
v
86
v = 8 m.s-1
v vL
fL fS
v vS
v 8
850 = x 871
v
v = 331,81 m.s-1 (7)
6.5 Used to measure the direction and speed of blood flow in arteries and veins.
Dit word gebruik om die rigting en spoed van bloedvloei in slagare en are te
bepaal.
Used to monitor the heartbeat of a newly formed foetus.
Dit word gebruik om die hartklop van 'n pasgemaakte fetus te monitor. (2)
[15]
QUESTION/VRAAG 7
7.1 25o (1)
7.2 The magnitude of the electrostatic force exerted by one point charge (Q1) on
another point charge (Q2) is directly proportional to the product of the
(magnitudes) of the charges and inversely proportional to the square of the
distance (r) between them.
Die grootte van die elektrostatiese krag wat een puntlading (Q1) op 'n ander
puntlading (Q2) uitoefen, is direk eweredig aan die grootte van die produk van
die ladings en omgekeerd eweredig aan die kwadraat van die afstand (r)
tussen hulle. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
7.3 T sin θ = FE
480 sin 25° = FE
FE = 202,8567656 N
k Q 1Q 2
FE = 2
r
9 2
9 x10 xQ
202,8567656 = 2
0, 0 2
Q = 3,00 x 10-6 C (5)
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(EC/SEPTEMBER 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 13
7.4.1 Positive marking from 7.3. / Positiewe nasien vanaf 7.3
OPTION 1/ OPSIE 1 OPTION 2 / OPSIE 2
kQ Enet = E1 + E2
E= 2 Any one/ Enige een
r kQ kQ
Enet = 2 + 2
9 6
9 x10 x 3, 0 0 x 1 0 r1 r2
E1 = 2
9 6 9 6
0 ,1 5 9 x 1 0 x 3, 0 0 x 1 0 9 x 1 0 x 3, 0 0 x 1 0
Enet = -
E1 = 1 200 000 N.C-1 left/links 0,1 5
2
0, 0 5
2
6
9 x10
9
x 3, 0 0 x 1 0 Enet = 10 800 000 –1 200 000
E2 =
0, 0 5
2 Enet = 9 600 000 N.C-1, right/regs
E2 = 10 800 000 N.C-1 right/regs OR/OF
Enet = E1 + E2 Enet = 9,60 x 106 N.C-1, right/regs
Enet = 10 800 000 –1 200 000
Enet = 9 600 000 N.C-1, right/regs
OR/OF
Enet = 9,60 x 106 N.C-1, right/regs. (5)
7.4.2 Positive marking from 7.3. / Positiewe nasien vanaf 7.3
OPTION 1/ OPSIE 1 OPTION 2/ OPSIE 2
Fn e t k Q 1Q 2
Enet = F= 2
q r
9 6 19
Fn e t 9 x 1 0 x 3, 0 0 x 1 0 x 1, 6 x 1 0
9 600 000 = 19
F1 = 3 2
1, 6 x 1 0 (5 0 x 1 0 )
Fnet = 1,536 x 10-12 N F1 = 1,728 x 10-12 N right Both/Beide
Fnet = ma 9
9 x 1 0 x 3, 0 0 x 1 0
6
x 1, 6 x 1 0
19
1,536 x 10-12 = 9,11 x 10-31 a F2 = 3 2
(1 5 0 x 1 0 )
a = 1,69 x 1018 m.s-2
F2 = 1,92 x 10-13 N left/links
Fnet = F1 + F2
Fnet = 1,728 x 10-12 – 1,92 x 10-13
Fnet = 1,536 x 10-12 N right/regs
Fnet = ma
1,536 x 10-12 = 9,11 x 10-31 a
a = 1,69 x 1018 m.s-2 (5)
[18]
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14 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
QUESTION/VRAAG 8
8.1 OPTION 1/ OPSIE 1 OPTION 2/ OPSIE 2
1 1 1 R1R2
Rp
Rp R1 R2 R1 R2
1 1 1 6x8
Rp
Rp 6 62 68
1 7 Rp = 3,43 Ω
Rp 24
Rp = 3,43 Ω (3)
8.2 8.2.1 Cost/Koste = E(kWh) x price/prys
6,75 = E(kWh) x 1,50
E(kWh) = 4,5 kWh
W
P=
t
4, 5
P=
5x5
P = 0,18 kW
P = 180 W (4)
8.2.2 Positive marking from 8.2.1/ Positiewe nasien vanaf 8.2.1
P = VI
180 = (60)I
I=3A (3)
8.3 8.3.1 Positive marking from 8.1 and 8.2.2/ Positiewe nasien vanaf 8.2.1
en 8.2. 2
V
R=
I
Vr
1=
3
Vr = 3 V
Vp
3,43 =
3
Vp = 10,29 V
Emf/emk = Vload + Vr
Emf/emk = 60 + 10,29 + 3
Emf/emk = 73,29 V (5)
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(EC/SEPTEMBER 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 15
8.3.2 Positive marking from 8.1, 8.2.1 & 8.2.2/
Positiewe nasien vanaf 8.1, 8.2.1 en 8.2.2
OPTION 1/OPSIE 1 OPTION 2/ OPSIE 2
P = I2R V
180 = (3)2R R=
I
R = 20 Ω 60
R=
3
R = 20 Ω
OPTION 3/OPSIE 3 OPTION 4 /OPSIE 4
V
2
emf = I (R + r )
P= 73,29 = 3 (R + 1)
R
2 R = 23,43
60
180 = R = Rp + Rs
R 23,43 = 3,43 + Rs
R = 20 Ω Rs = 20 Ω (3)
[18]
QUESTION/VRAAG 9
9.1 Mechanical to electrical / Meganies na elektries (2)
9.2 To reverse the direction of the current each half cycle.
Om die rigting van die stroom elke halfsiklus om te keer.
OR/ OF
Allow for constant direction of rotation of the coil.
Laat toe vir die konstante draairigting van die spoel. (1)
9.3
Emf/emk (V)
Time/Tyd (s)
D.C. graph /Correct shape
GS grafiek/ korrekte vorm
Two peaks only (one cycle)
Slegs twee pieke (een siklus) (2)
9.4 Increase the strength of the magnetic field
Verhoog die sterkte van die magnetiese veld
Increase the number of turns on the coil
Verhoog die aantal draaie op die spoel Any one/Enige een
Rotate the coil faster
Draai die spoel vinniger (1)
[6]
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16 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/SEPTEMBER 2019)
QUESTION/VRAAG 10
10.1 The DC potential difference/voltage that dissipate the same amount of
energy as an AC source.
Die wgk-waarde van WS is die GS-potensiaalverskil/spanning wat dieselfde
hoeveelheid energie verbruik as die WS-bron. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
10.2 OPTION 1/OPSIE 1 OPTION 2/OPSIE 2
PAverage = Irms/wgkVrms/wgk 2
V rm s
2 000 = Irms/wgkx 230 P A v e ra g e
2
Irms /wgk= 8,70 A 2
230
Ir m s
Im a x 2 000
R
2
R 2 6, 4 5
Im a x
8,70 = V rm s
2 R
Ir m s
Imax/maks = 12,30 A
230
2 6, 4 5
Ir m s
Irms/wgk = 8,70 A
Im a x
Ir m s
2
I
8,70 = m a x
2
Imax/maks = 12,30 A (4)
[6]
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(EC/SEPTEMBER 2019) PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 17
QUESTION/VRAAG 11
11.1 The minimum frequency required to emit electrons from a metal surface.
Die minimum frekwensie benodig om elektrone uit 'n sekere metaaloppervlak
vry te stel. (2)
NOTE:/LET WEL:
If any of the underlined key words in the correct context is omitted deduct 1
mark.
Indien enige van die onderstreepte sleutel woorde in die korrekte konteks
uitgelaat is, trek 1 punt af.
11.2 Wo = hfo
Wo = (6,63 x 10-34)(1,50 x 1014)
Wo = 9,95 x 10-20 J (3)
11.3 Positive marking from 11.2/ Positiewe nasien vanaf 11.2
E = W 0 + Ek(max/maks)
2
E = W 0 + ½ m v (m a x)
Any one/Enige een
hc 1 2
W0 m v (m a x )
2
34 8
6, 6 3 x 1 0 x 3 x10 1 31
7
= 9,95 x 10-20 + x 9 ,1 1 x 1 0 v (m a x )
2
5, 4 x 1 0 2
v(max/maks) = 7,68 x 105 m.s-1 (5)
11.4
Ek(max./maks.)
(J)
fo
Frequency/frekwensie (Hz)
Correct shape/Korrekte vorm
Both axes labeled/ Albei asse gemerk
Threshold frequency, fo / Drumpelfrekwensie, fo (3)
[13]
TOTAL/TOTAAL: 150
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