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NATIONAL
SENIOR CERTIFICATE/
NASIONALE
SENIOR SERTIFIKAAT
GRADE/GRAAD 12
JUNE/JUNIE 2019
PHYSICAL SCIENCES P1
MARKING GUIDELINE/
FISIESE WETENSKAPPE V1
NASIENRIGLYN
MARKS/PUNTE: 150
This marking guideline consists of 20 pages.
Hierdie nasienriglyn bestaan uit 20 bladsye.
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Physical Sciences Grade 12 Paper 1 EC June 2019 Memo
Grade 12 Physical Sciences Paper 1 memorandum from the EC June 2019, 24 pages. Read online or get the free PDF download, question paper linked when available.
Physical Sciences · Grade 12 · EC June · 2019. Memorandum, 24 pages. Read online or download the PDF.
- Subject
- Physical Sciences
- Grade
- Grade 12
- Document type
- Memorandum
- Year
- 2019
- Exam period
- EC June
- Paper
- 1
- Curriculum
- CAPS
- Pages
- 24
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2 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 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 sustitusies.
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 began
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 verkeerde
verander, sal die punte vir die formule en korrekte substitusies toegeken
word. Die punt vir die verkeerde numeriese antwoord word verbeur.
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 3
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 ʼn
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
formule ingestel word en nie vir waardes wat voor ʼn berekening gelys
is nie.
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 no 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.
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4 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
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.
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.
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 5
3.3 Separate compound units with a multiplication dot, no 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 in 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 3.1 is incorrect, no
marks can be awarded for QUESTION 3.2. However, if the answer for e.g.
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 3.1 is
verkeerd, kan geen punte vir VRAAG 3.2 toegeken word nie. Indien die
antwoord op bv. 3.1 egter op ʼn berekening gebaseer is, kan die motivering vir
die verkeerde antwoord in 3.2 oorweeg word.
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6 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
QUESTION/VRAAG 1
1.1 C (2)
1.2 A (2)
1.3 B (2)
1.4 D (2)
1.5 C (2)
1.6 A (2)
1.7 B (2)
1.8 D (2)
1.9 A (2)
1.10 A (2)
[20]
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 7
QUESTION /VRAAG 2
2.1 When a net force/resultant force acts on an object, it produces the
acceleration of the object in the direction of the net force/resultant force.
This acceleration is directly proportional to the net/resultant force and
inversely proportional to the mass of the object.
Indien ʼn netto/resulterende krag op ʼn voorwerp inwerk, veroorsaak dit ʼn
versnelling van die voorwerp in die rigting van die netto/resulterende krag.
Hierdie versnelling is direk eweredig aan die netto/resultante
krag en omgekeerd eweredig aan die massa van die voorwerp. (2)
2.2 OPTION/OPSIE 1 OPTION/OPSIE 2
FN FN FY
FJane Ff FJane
Ff
T T
Fg Fg
Mark awarded for both arrow and label./Punt toegeken vir beide pylpunt en
byskrif.
Do not penalise for length of forces since drawing is not drawn to scale.
Moenie penaliseer vir lengte van kragte want diagram is nie volgens skaal
nie.
Any other additional force(s)/Enige addisionele krag(te)
If force(s) do not make contact with body/Indien krag(te) nie kontak maak
met voorwerp nie. Max./Maks.
(5)
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8 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
2.3 Choose East (Right) to be positive/Kies Oos (regs) as positief.
4 kg box/-houer
Fnet = ma
Fx + fk + T = ma Any one / Enige een
Fx - fk - T = ma
FJaneCos30° + fk + T = ma
80x0,866 + (-8,14) + (-T) = 4a
69,28 – 8,14 – T = 4a
61,14 – T = 4a -------- (1)
5 kg box/-houer
Fnet = ma
T + W = ma
T + (-9,8x5) = 5a
T – 49 = 5a
T - 49
a= ------(2)
5
Subst (2) in (1):/Stel (2) in (1):
T-49
61,14 – T = 4
5
305,7 – 5 T = 4 T – 196
9 T = 501,7
T = 55,74 N (5)
[12]
QUESTION/VRAAG 3
3.1 Each body in the universe attracts every other body with a force that is
directly proportional to the product of their masses and inversely
proportional to the square of the distance between their centres.
Elke liggaam in die heelal trek elke ander liggaam aan met ʼn krag wat direk
eweredig is aan die produk van hulle massas en omgekeerd eweredig
aan die kwadraat van die afstand tussen hulle middelpunte. (2)
3.2 OPTION/OPSIE 1 OPTION/OPSIE 2
G m 1m 2 GMm
F = gm =
r2 Rm
11 22
6,67 x 10 x 7,35 x 10 m2 6,67 x1011 x 7,35 x1022
126,30= =
(1,74 x 106 )2 (1,74 x104 )2
m2 = 78,00 kg = 1,619252874
w = mg
126,30 = m x 1,619252874
m = 78,00 kg (4)
[6]
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 9
QUESTION/VRAAG 4
4.1 Projectile motion is the motion of an object upon which the only force acting
is the force of gravity.
Projektielbeweging is die beweging van ʼn voorwerp waarop die enigste
krag wat daarop inwerk, gravitasiekrag is.
OR/OF
Projectile motion is the motion of an object that experiences only
gravitational force.
Projektielbeweging is die beweging van ʼn voorwerp wat slegs
gravitasiekrag ondervind. (2)
4.2 OPTION/OPSIE 1
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf = vi + g∆t vf = vi + g∆t
0 = (13) + (-9.8 ). ∆t 0 =(-13) + (9.8) .∆t
∆t = 1,33 s ∆t = 1,33 s (3)
OPTION/OPSIE 2
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf2 = vi2 + 2a∆y vf2 = vi2 + 2a∆y
02 = 132 + 2 (-9,8) ∆y 02 = -132 + 2 (9,8) ∆y
∆y = 8,62244898 m ∆y = - 8,62244898 m
v f vi v f vi
∆y = ∆t ∆y = ∆t
2 2
0 13 0 13
8,62244898 = ∆t -8,62244898 = ∆t
2 2
∆t = 1,33 s ∆t = 1,33 s (3)
OPTION/OPSIE 3
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf2 = vi2 + 2g∆y vf2 = vi2 + 2g∆y
02 = 132 + 2 (-9,8) ∆y 02 = -132 + 2 (9,8) ∆y
∆y = 8,62244898 m ∆y = 8,62244898 m
1 1
∆y = vi∆t + g∆t2 ∆y = vi∆t + g∆t2
2 2
1 1
8,62 = 13 ∆t + (- 9,8) ∆t2 -8,62 = -13 ∆t + (9,8) ∆t2
2 2
∆t = 1,33 s ∆t = 1,33 s (3)
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10 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
4.3 OPTION/OPSIE 1
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf 2 = vi2 +2 g∆y vf 2 = vi2 +2 g∆y
02 = (13)2 + 2 (-9,8) ∆y 02 = (-13)2 + 2 (9,8) ∆y
∆y = 8,62 m ∆y = 8,62 m
OPTION/OPSIE 2
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
1 1
∆y = vi∆t + g∆t2 ∆y = vi∆t + g∆t2
2 2
1 1
= 13(1,33) + (-9,8)(1,33)2 = -13(1,33) + (9,8)(1,33)2
2 2
= 8,62 m = -8,62 m
= 8,62 m, (upwards/opwaarts)
OPTION/OPSIE 3
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
v f vi v f vi
∆y = ∆t ∆y = ∆t
2 2
0 13 0 13
= x 1,33 = x 1,33
2 2
= 8,65 m = -8,65 m
= 8,65 m (4)
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 11
4.4 4.4.1 OPTION/OPSIE 1
Taking top of building as starting point /
Neem toppunt van gebou as beginpunt
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf = vi + a∆t vf = vi + a∆t
vf = 0 + (-9,8)(3,28 - 1,33) vf = 0 + (9,8)(3,28 - 1,33)
-1
vf = -19,11 m.s vf = 19,11 m.s-1
-1
vf = 19,11 m.s
OPTION/OPSIE 2
Taking balcony as a starting point
Neem balkon as beginpunt
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf = vi + a∆t vf = vi + a∆t
vf = -13 + (-9,8)(3,28 - 1,66) vf = 13 + (9,8)(3,28 – 2,66)
-1
vf = -19,08 m.s vf = 19,08 m.s-1
-1
vf = 19,08 m.s (3)
4.4.2 OPTION/OPSIE 1
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
1 1
∆y = h = vi∆t + a∆t2 ∆y = h = vi∆t + a∆t2
2 2
1 1
h = -13(0,62) + (-9,8)(0,62)2 h = 13(0,62) + (9,8)(0,62)2
2 2
h = - 9,94 m = 9,94 m
Height of building/Hoogte van Height of building/Hoogte van
gebou gebou
= h + ∆y = h + ∆y
= 8,62 + 9,94 = 8,62 + 9,94
= 18,56 m = 18,56 m
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12 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
OPTION/OPSIE 2
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf2 = vi2 + 2a∆y vf2 = vi2 + 2a∆y
(-19,11)2 = (-13)2 + 2(-9,8)(∆y1) (-19,11)2 = (-13)2 + 2(-9,8)(∆y1)
h = ∆y = 10,01 m h = ∆y = 10,01 m
Height of building/Hoogte van gebou Height of building/Hoogte van
= ∆y + h gebou
= 8,62+ 10,01 = ∆y + h
= 18,62 m = 8,62+ 10,01
= 18,62 m
OPTION/OPSIE 3
(upwards positive) (downwards positive)
(opwaarts positief) (afwaarts positief)
vf2 = vi2 + 2a∆y vf2 = vi2 + 2a∆y
(-19,08)2 = (-13)2 + 2(-9,8)∆y (-19,08)2 = (-13)2 + 2(-9,8)∆y
h = ∆y = 9,95 m h = ∆y = 9,95 m
Height of building/Hoogte van gebou Height of building/Hoogte van
= ∆y + h gebou
= 8,62+ 9,95 = ∆y + h
= 18,57 m = 8,62+ 9,95
= 18,57 m (6)
[18]
QUESTION/VRAAG 5
5.1 Downwards / Afwaarts (1)
5.2 Two (times) OR 2 (times)
Twee (keer) OF 2 (keer) (1)
5.3 Elastic / Elasties (1)
5.4 4 s and / en 8 s (2)
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 13
5.5 Positive marking from QUESTION 5.4 / Positiewe merk vanaf
VRAAG 5.4
Position-time graph / Posisie-tyd grafiek
8
∆x
(m)
0
2 4 6 8 ∆t (s)
(Max. height 1) (Max. height 2)
(Maks. hoogte 1) (Maks. hoogte 2)
Criteria for graph / Kriteria vir die grafiek Marks/Punte
The height from which the ball was dropped
Hoogte van waar bal laat val is
The times when the ball was at its maximum height – 4 s
and 8 s
Die tye wanneer die bal sy maksimum hoogte bereik – 4 s
en 8 s
Shape of the graph/Vorm van die grafiek (3)
[8]
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14 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
QUESTION/VRAAG 6
6.1 The total linear momentum of an isolated system is conserved.
Die totale lineêre momentum van ʼn geïsoleerde sisteem bly behoue.
OR/OF
In an isolated system the total linear momentum before collision is equal to
the total linear momentum after collision.
In ʼn geïsoleerde sisteem is die totale lineêre momentum voor ʼn botsing
gelyk aan die totale lineêre momentum na ʼn botsing. (2)
6.2 pi = pf
mvviv + mcvic = mvvfv +mcvfc
80000
1500 x 30 + 1200 x = 1500 vfv + 1200 x 25
3600
vfv = 27,78 m.s-1 in the same direction / in dieselfde rigting. (5)
6.3 OPTION/OPSIE 1 OPTION/OPSIE 2
∆p = mvf - mvi ∆p = mvf - mvi
∆p = 1200 x 25 – 1200 x
80000
∆p = 1500 x 27,78 – 1500 x 30
3600 ∆p = -3330 kg.m.s-1
∆p = 3333,33 kg.m.s-1 ∆p = 3330 kg.m.s-1
In the direction of the motion In the direction of the motion
In dieselfde rigting as beweging In dieselfde rigting as beweging (3)
6.4 Eki = m vic2 + mviv2
80000 2
Eki = x 1200 x ( )+ x 1500 x 302
3600
Eki = 971296,30 J
Ekf = m vfc2 + mvfv2
Ekf = x 1200 x (25)2+ x 1500 x 27,782
Ekf = 953796,30 J
Eki Ekf
Collision is inelastic / Botsing is onelasties (5)
[15]
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 15
QUESTION/VRAAG 7
7.1 To the right / na regs
For momentum to be conserved:
momentum of trolley B = momentum of trolley A.
momentum of B must be in an opposite direction to the momentum of
trolley A
Vir momentum om behoue te bly:
momentum van trollie B = momentum van trollie A.
momentum van trollie B is in die teenoorgestelde rigting as die
momentum van trollie A. (3)
7.2 Let right/East be positive/Laat regs/Oos positief wees
Σpi = Σpf
mAvAi + mBvBi = mAvAf + mBvBf Any one / Enige een
(mA + mB) vi = mAvAf + mBvBf
(0,5 + 0,75) x 0 = 0,5 x (-2,5) + 0,75vBf
vBf = 1,66 m.s-1 (to the right/East)/(na regs/oos) (4)
7.3.1 21,5 N
According Newton’s Third law of motion, when the wall exerts a force
on the trolley, the trolley simultaneously exerts a force (of 21,5 N) on the
wall but in an opposite direction.
Volgens Newton se Derde Bewegingswet, indien die muur ʼn krag op
die trollie uitoefen, oefen die trollie gelyktydig ʼn krag (van 21,5 N) op die
muur maar in die teenoorgestelde rigting.
NOTE: If learners just state Newton’s third law without using it
to explain, no marks will be awarded
LET WEL: As leerders net Newton’s se derde wet sê sonder
om teverduidelik, sal geen punte toegeken word.
(3)
7.3.2 Fnet ∆t = m ∆v
Fnet ∆t = m ∆(vAf - vAi) Any one / enige
-21,5 x 0,1 = 0,5(vAf – 2,5)
-2,15 = 0,5 vAf – 1,25
vAf = -1,8 m.s-1
vAf = 1,8 m.s-1 (to the left/west)(na links/wes) (5)
7.3.3 Remains the same. / Bly dieselfde.
When the contact time increases, the net force decreases.
Indien die kontaktyd toeneem, verminder die netto krag. (3)
[18]
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16 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
QUESTION/VRAAG 8
8.1 The (total) mechanical energy of an isolated system is conserved.
Die (totale) meganiese energie van ʼn geïsoleerde sisteem bly behoue. (2)
8.2 OPTION/OPSIE 1 OPTION/OPSIE 2
MEB = MEC Wnc = ∆Ek + ∆Ep
(EP + EK)B = (EP + EK)C
0 = m vf2 - m vi2 + mgh2 – mgh1
(mgh + m v2)B = (mgh + m v2)B
0 =0 - (0,2)vi2 + 0,2(9,8)(1,2) – 0
0+ (0,2)vi2 = 0,2(9,8)(1,2)+ 0 Vi = 4,85 m.s-1
-1
Vi = 4,85 m.s (4)
8.3 OPTION/OPSIE 1 OPTION/OPSIE 2 OPTION/OPSIE 3
v v vf = vi + a∆t vf = vi + a∆t
∆x = f i ∆t
2 4,85 = 6 + a x 0,82 4,85 = 6 + a x 0,82
=
6 4,85
x 0,82 a = - 1,40 m.s-2 a = - 1,40 m.s-2
2 1
= 4,45 m ∆x = vi∆t + a∆t2 vf2 = vi2 + 2a∆x
2
= 6x0,82 + 0,5xax0,822 4,852 = 62 + 2(-1,4) ∆x
= 4,45 m ∆x = 4,46 m
(3)
[9]
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 17
QUESTION/VRAAG 9
9.1 The net work done on an object is equal to the change in the kinetic energy
of the object.
Die netto arbeid verrig op ʼn voorwerp is gelyk aan die verandering in die
kinetiese energie van die voorwerp.
OR/OF
The amount of work done by a net force on object is equal to the change in
the object’s kinetic energy.
Die hoeveelheid arbeid wat deur ʼn netto krag verrig word op ʼn voorwerp is
gelyk die verandering in die voorwerp se kinetiese energie. (2)
9.2 OPTION/OPSIE 1 OPTION/OPSIE 2
FN Fapp FN Fapp
Ff
Ff
Fg
Fg//
Fg┴
(4)
Mark awarded for both the arrow and label
Punt toegeken vir beide pylpunt en byskrif.
Do not penalise for length of forces since drawing is not drawn to scale.
Moenie penaliseer vir lengte van kragte want diagram is nie volgens skaal nie.
Any other additional force(s)/Enige addisionele krag(te)
If force(s) do not make contact with body/Indien krag(te) nie kontak maak met
voorwerp nie. Max./Maks.
9.3 OPTION/OPSIE 1
Wnet = ∆EK Any one / Enige een
Wnet = WApp + W// + Wf
WApp + W// + Wf = ∆EK
260(8)Cos0°) + 0,16(25)(9,8)(Cos40°)(8)(Cos180°) +
1
25(9,8)(sin40°)(8)(Cos180°) = (25)vf2 – 0
2
2080 – 240,23 -1259,86 = 12,5 vf²
579,91 = 12,5 vf2
vf = 6,81 m.s-1
OPTION/OPSIE 2
Wnc = ∆EK+ ∆Ep
Wapp + Wf = ∆EK+ WFg Any one / Enige een
260(8)(cos0°) + 0,16(25)(9,8)(Cos40°)(8)(cos180°) =
1
25(9,8)(Sin40°)(8)(cos180°) + (25)vf2 – 0
2
vf = 6,81 m.s-1 (6)
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18 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
9.4 OPTION/OPSIE 1 OPTION/OPSIE 2
(v i + v f ) v f vi
∆x = ∆t vav =
2 2
(0 + 6,81) 0 6,81
8= ∆t vav =
2 2
∆t = 2,35 s vav = 3,405
W Pav = F.vAv
P= Pav = 260 x 3,405
∆t
= 885,3 W
P = 2080
2,35
= 885,11 W (4)
[16]
QUESTION/VRAAG 10
10.1.1 Doppler effect is 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 .
Die Doppler-effek is die verandering in frekwensie (of toonhoogte) van die
klank wat deur die waarnemer waargeneem word omdat die bron van die
klank en die luisteraar verskillende snelhede het relatief tot die medium van
die klank.
OR/OF
Doppler effect is the apparent change in frequency of a wave when there
is relative motion between the source and an observer .
Die Doppler-effek is die skynbare verandering in die frekwensie van ʼn golf
wanneer daar relatiewe beweging tussen die bron en luisteraar is.
OR/OF
Doppler Effect is an (apparent) change in observed/detected frequency
(pitch), (wavelength) as a result of the relative motion between a source
and an observer (listener)
Die Doppler-effek is die (skynbare) verandering in die waargenome
frekwensie (toonhoogte)(golflengte) as gevolg van die relatiewe beweging
tussen ʼn bron en ʼn luisteraar. (2)
10.1.2 750 Hz (1)
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(EC/JUNIE 2019) FISIESE WETENSKAPPE V1/FISIESE WETENSKAPPE VI 19
10.1.3 1) Waves are compressed as Khosi moves towards the source.
2) Wavelength become shorter.
3) Wavelength is inversely proportional to frequency, hence the detected
frequency is higher.
1) Golwe word saamgepers soos Khosi na die bron beweeg.
2) Golflengte word korter.
3) Golflengte is omgekeerd eweredig aan frekwensie, dus is die
waargeneemde frekwensie hoër. (3)
10.1.4
When Khosi approaches:/ (Terwyl Khosi nader beweeg):
340 vL
750 = fs
340
750 x 340
fs = …… (1)
340 vL
When the Khosi moves away: (Terwyl Khosi wegbeweeg):
340 vL
700 = fs
340
700 x 340
fs = ……… (2)
340 vL
(1) = (2) :
750 x 340 700 x 340
340 vL 340 vL
750(340 – vL) = 700(340 + vL)
1450vL = 17000
VL = 11,72 m.s-1 (6)
OPTION/OPSIE 1 OPTION/OPSIE 2
750 x 340 700 x 340
fs = 340 11,72
fs =
340 11,72
fs = 725,01 Hz fs = 724,99 Hz (3)
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20 PHYSICAL SCIENCES P1/FISIESE WETENSKAPPE V1 (EC/JUNE 2019)
10.2.1 Away/Weg van
It shows a red shift. / Dit toon ʼn rooi verskuiwing.
Frequency is decreasing. / Frekwensie neem af.
Wavelength becomes longer. / Golflengte word langer. (4)
10.2.2 The universe is expanding. / Die heelal is besig om uit te sit. (1)
[20]
QUESTION/VRAAG 11
11.1 The force per unit positive charge./
Die krag per eenheid positiewe lading. (2)
11.2 E=
kQ
r2 Any one/Enige een
Enet = E1 + E2
9 x109 x 6 x106 9 x109 x 4 x10 6
0 ( )
(0,2 x)2 x2
x = 0,09 m (6)
[8]
TOTAL/TOTAAL: 150
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