Grade 12 KZN Physical Sciences March 2024 Marking Guideline
Grade 12 KZN Physical Sciences March 2024 Marking Guideline
Grade 12 KZN Physical Sciences March 2024 Marking Guideline
NSC
NATIONAL
SENIOR CERTIFICATE
GRADE 12
PHYSICAL SCIENCES
COMMON TEST
MARKING GUIDELINE
MARCH 2024
MARKS : 100
QUESTION 1
QUESTION 2
2.1 When a net force acts on an object, the object will accelerate in the direction of
the force and the acceleration is directly proportional to the force and inversely
proportional to the mass of the object. (2)
2.2
Accept T
N
Fk
fg// fg┴
Accepted labels
W Fg/Fw/Wight/Gravitational force
fk f/friction/Kinetic friction
N FN/Normal force
T Tension/FT/T
(4)
2.3.1 N Fg
N mg cos
N (3)(9,8)cos300
N 25,46N (2)
2.3.2 fk k N
fk (0,15)[(5)(9,8) (60)sin 200 ]
fk 10,43N (3)
2.3.3 POSITIVE MARKING FROM 2.3.1 AND 2.3.2
3kg:
Fnet ma
T ( fk ) ( fgII ) ma
T (0,15)(25,46) (3)(9,8)sin300 (3)a
T 3a 18,52 …………eq.1
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Physical Sciences/P2 3 March 2024 Common Test
NSC
5kg:
Fnet ma
fx ( fk ) ( T ) ma
(60)cos200 10,43 T (5)a
T 45,95 5a ………eq.2
3a 18,52 45,95 5a
a 3,43m.s 2
T 3(3,43) 18,52
T 28,81N
OR (5)
T 45,95 5(3,43)
T 28,80N
[16]
QUESTION 3
(1)
3.1 Inertia.
3.2
3.3
v f v i at v f v i at
0 20 ( 9,8)t 0 20 (9,8)t
(3)
t 2,04s t 2,04s
1 1
y v i t at 2 y v i t at 2
2 2
y (20)(2,04) (0,5)( 9,8)(2,04)2 y ( 20)(2,04) (0,5)(9,8)(2,04)2
y 20,41m y 20,41m (6)
OR y 20,41m
v f v i 2ay
2 2
OR
(0)2 (20)2 2( 9,8)y v f2 v i2 2ay
y 20, 41m (0)2 ( 20)2 2(9,8)y
y 20,41m
Distance = 40,80 – 20,41
= 20,39 m Distance = 40,80 – 20,41
= 20,39 m
Upwards Positive
Marking criteria
Initial velocity 20 m.s-1/72 km/h
Time for the ball at maximum height, 2,04s
Time for the ball passing point Y, 4,08s
(4)
Straight line graph extending beyond point Y.
[16]
QUESTION 4
4.2
p before pafter
m1v i1 m2v i2 ( m1 m2 )v f
m1(30) (1100)( 20) (m1 1100)(10)
m1 = 1650 kg
The total mass is less than the allowed mass.
No. (5)
OPTION 2
∆
F =
∆
m(𝑣 − 𝑣 )
F =
∆t
2750(0 − 10)
−2500 =
∆t
∆t = 11 s
v +𝑣
∆x = × ∆𝑡
2
10 + 0
= × 11
2
= 55 m
[12]
QUESTION 5
5.1.1 1-chloro-2,3-dimethylpentane
Marking criteria:
correct stem
correct substituents: chloro and dimethyl
IUPAC name completely correct including numbering, sequence and hyphen
(3)
5.1.2 B and E
Have the same molecular formula but different functional groups
OR
Have the same molecular formula but B is a ketone whereas E is an
aldehyde
Marking criteria:
If any one of the underlined key phrases in the correct context is omitted , deduct
1 mark.
The underlined phrases must be in the correct context.
(3)
5.1.3 F
The C atom bonded to the functional group/hydroxyl (group)/-OH is bonded to
three other C atoms. (3)
H H H H
│ │ │ │
H ― C ― C ≡ C ― C ― C ― C ― C ― H
│ │ │ │
H H H H
H ― C ― H
│
H
Marking criteria:
Correct functional group
correct stem and substituents: heptyne, dimethyl
Whole structure correct
(3)
5.2.1
H O C
% 9,80 31,38 58,82
C5H10O2
Marking criteria:
Correctly calculating number of mols of H, C and O
Correct ratio
Correct empirical formula
(6)
5.2.2 H H H O H
│ │ │ ║ │
H ― C ― C ― C― O ― C ― C ― H
│ │ │ │
H H H H
Marking criteria:
Functional group correct
Whole structure correct
(3)
(1)
[22]
QUESTION 6
6.1.
Marking criteria:
If any one of the underlined key phrases in the correct context is omitted, deduct 1
mark.
The underlined phrases must be in the correct context.
7.1.1
H H H
│ │ │
H ― C ― C ═ C ― H
│
H
Marking criteria:
Functional group correct
Whole structure correct
(2)
7.2.2 Elimination
dehydrohalogenation (2)