Page 36 - Hybrid PBD KSSM 2021 Tg 5 - Fizik

Fizik Tingkatan 5 Bab 1
Panjang asal = l = (12 – 2) cm = 10 cm
Initial length
11. Apakah maksud tenaga keupayaan kenyal? SP 1.4.3 TP1
What is meant by elastic potential energy?
Tenaga keupayaan kenyal ialah tenaga yang tersimpan dalam spring apabila spring itu dipanjangkan atau
dimampatkan .

Elastic potential energy is the energy stored in a spring when the spring is lengthened or compressed .

12. Tenaga keupayaan kenyal, E yang tersimpan di dalam suatu spring ialah luas di bawah graf. Lengkapkan graf
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P
di bawah dan terbitkan formula tenaga keupayaan kenyal. SP 1.4.3 TP2
The elastic potential energy, E stored in a spring is the area under the graph. Complete the graph below and derive the formula of the elastic
P
potential energy.

x / cm
Tenaga keupayaan kenyal / Elastic potential energy:
1
E = Fx
P 2
Jika / If F = kx
1
E = 2 (kx)x
P
E = 1 kx 2 0 F / N
2
P
13. Rajah di bawah menunjukkan spring sebelum dan selepas dimampatkan. SP 1.4.4 TP2
Diagram below shows a spring before and after being compressed.
500 g

15.0 cm
12.0 cm

Apakah nilai tenaga keupayaan elastik yang tersimpan dalam spring termampat?
What is the value of elastic potential energy stored in the compressed spring?
Pemampatan spring, x = 15 cm – 12 cm = 3 cm = 0.03 m
Spring compression
F 0.5 × 10 N
Pemalar spring, k = = = 166.67 N m –1
Elastic potential energy x 0.03 m
1
Tenaga keupayaan kenyal, E = 2 kx 2
P
1
E = (166.67)0.03 2
P 2
E = 0.075 J
P

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Bab 1.indd 24 11/19/21 4:05 PM