Page 51 - Focus TG4 KSSM (Physics) Terbitan Penerbitan Pelangi Sdn Bhd

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Chapter Checkpoint 1.2 Subjective Questions
1 Measurement Q1 (a) (i) An inference is an initial Section A
interpretation or explanation
concerning the observation. 1. (a) (i) s × m s = m
–2
2
(ii) A hypothesis is a statement (ii) Base quantity
Checkpoint 1.1
of an expected outcome (b) (i) 0.25 × 0.12 × 0.5 = 0.015 m 3
Q1 Physical Base or that usually states the (ii) 1.5 = 100 kg m –3
Description derived relationship between two 0.015
quantity or more variables intended
quantity 2. (a) m / kg T / s 2
2
Base to be given a direct
Total 55.2 g Mass experimental test. 2.0 0.8464
quantity (iii) A variable is a physical
3
150 cm of Volume Derived quantity that can be varied 3.0 1.2996
hot water quantity in an experiment. 4.0 1.7689
(b) (i) The extension of the spring
Base 5.0 2.1609
80°C Temperature depends on the weight of
quantity the object attached to it. 6.0 2.6569
Within 3 Time Base (ii) The bigger is the magnitude
minutes quantity of the weight, the greater is (b)
the extension of the spring.
9 kJ of Energy Derived (iii) • Manipulated variable: T /s 2
2
energy quantity
Weight of object attached 3.0
to the spring.
Q2 (a) (i) 7 500 000 m • Responding variable: 2.5
= 7 500 000 × 10 km Extension of the spring.
–3
= 7 500 km • Fixed variable: Type of 2.0
(ii) 7 500 000 m spring.
= 7 500 000 × 10 Mm Q2 (a) To investigate the relationship
–6
= 7.5 Mm between the distance of 1.5
extension of the elastic cord, x
7 853 m 1.0
(b) 7 853 m s = 1 s and the horizontal distance, d
–1
–3
7 853 × 10 km travelled by the ball. 0.5
= (b) The further the distance of
1
 60 × 60 h extension of the elastic cord, 0 m / kg
x, the further is the horizontal
distance, d travelled by the ball. 0 1.0 2.0 3.0 4.0 5.0 6.0
= 28 270.8 km h –1
(c) • Manipulated variable: The 2.65 – 1.30 2 –1
Q3 (a) Base quantity is quantity with distance of extension of the (c) m = 6.0 – 3.0 = 0.45 s kg
magnitude only. elastic cord, x 3. (a) (i) Physical quantity is quantity
(b) Vector quantity is quantity with • Responding variable: The that can be measured.
magnitude and direction. horizontal distance travelled (ii) V is a responding variable
by the ball, d
Q4 Type of • Fixed variables: Type of because its value depends
Event Explanation on the other variables and
quantity elastic cord used, type of ball can only be determined
used and height of the table
1 Vector Magnitude (d) • Tabulation of data: from the experiment. l is
–1
700 km h and a manipulated variable
direction required x / cm because its value can be
to reach its d / cm fixed before the experiment
destination. and other variables depend
2 Scalar Only magnitude, • Analysis of data: on it and only can be
3 kg required. Plot a graph of d against x. determined from experiment.
If the gradient of the graph (b) (i) Graph of student A
3 Vector Magnitude of is positive, the hypothesis is • Weakness: Horizontal
force is 25 N accepted. axis, 6 divisions for 0.2
and the direction A is a difficult scale to
required to reach SPM Practice 1 determine the exact
the lift. position of value l.
Objective Questions • Weakness: Vertical axis,
4 Scalar Only magnitude
is involved, the 1. C 2. C 3. D 4. D 5. D 5 divisions for 0.4 V is a
temperature from 6. A 7. B 8. C 9. B 10. B difficult scale to determine
20 C to 100 C. 11. D 12. B 13. C 14. D the exact position of value
o
o
V.
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ANS FOC PHYSICF F4 1P.indd 252 29/01/2020 2:04 PM