Page 35 - Hybrid PBD KSSM 2021 Tg 5 - Fizik

Fizik Tingkatan 5 Bab 1
(a) Kira pemalar spring berdasarkan graf di atas.
Calculate the spring constant based on the graph above.

Pemalar spring = kecerunan graf = 20 N = 2.5 N cm –1
8 cm
20 N
The spring constant = gradient of the graph = = 2.5 N cm –1
8 cm
(b) Spring ini mempunyai pemalar spring 2.5 N cm yang memerlukan daya 2.5 N untuk
–1
memanjangkan spring itu sebanyak 1 cm .
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–1
This spring has a spring constant of 2.5 N cm requiring a force of 2.5 N to extend the spring by 1 cm .
9. Satu spring dengan panjang asal 10 cm diregangkankan oleh satu beban berjism 0.4 kg sehingga
panjangnya 12 cm.
A spring with an original length of 10 cm is stretched by a load of 0.4 kg to a length of 12 cm. SP 1.4.4 TP3 KBAT Mengaplikasi

(a) Kira pemalar spring.
Calculate the spring constant.
(b) Kira panjang spring jika beban berjisim 0.4 kg itu digantikan dengan satu beban berjisim 0.6 kg.
Calculate the length of the spring if a load of mass 0.4 kg is replaced by a load of mass 0.6 kg.
(a) Pemanjangan / Extension, x = 12 cm – 10 cm = 2 cm = 0.02 m
F 0.4 × 10 N
Pemalar spring / Spring constant, k = = = 200 N m –1
x 0.02 m
F 0.6 × 10
(b) Pemanjangan / Extension x = = = 0.03 m = 3 cm
k 200
Panjang spring / Length of the spring = 13 cm
10. Rajah di bawah menunjukkan kedudukan suatu spring apabila spring itu disambungkan dengan dua
pemberat yang berbeza.
The diagram below shows the position of a spring when the spring is connected with two different weights. SP 1.4.3 TP2

Rajah (a) Rajah (b) Rajah (c)
Diagram (a) Diagram (b) Diagram (c)
l cm 12 cm 16 cm

10 g
30 g

Apakah panjang asal spring tanpa pemberat?
What is the original length for a spring without weights?
Dengan membandingkan Rajah (b) dan Rajah (c), / Comparing Diagram (b) and Diagram (c)
Beban sebanyak 20 g (30 g – 10 g) memanjangkan spring sebanya 4 cm (16 cm – 12 cm)
Load of 20 g (30 g - 10 g ) extends the spring by 4 cm (16 cm – 12 cm)
F 0.02 × 10 N
Pemalar spring, k = = = 5 N m –1
Spring constant x 0.04 m
F 0.01 × 10
Pemanjangan untuk Rajah (a), x = = = 0.02 m = 2 cm
Extension in Diagram (a) k 5

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Bab 1.indd 23 11/19/21 4:05 PM