Hybrid PBD KSSM 2021 Tg 4 - Fizik

Fizik Tingkatan 4 Bab 2

Bahagian C
4. Rajah 4.1 dan 4.2 menunjukkan dua bola, P dan Q, yang serupa berjisim 400 g sebelum dan selepas
perlanggaran.
Diagram 4.1 and 4.2 shows two identical balls, P and Q, of mass 400 g before and after collision.
Bola P Bola Q
Ball P Ball Q u = 4 m s –1
u = 0 m s –1



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Rajah 4.1 / Diagram 4.1
Bola P Bola Q
Ball P Ball Q
v = 3 m s –1 v = 1 m s –1



Rajah 4.2 / Diagram 4.2

(a) Apakah yang dimaksudkan dengan momentum?
What is the meaning of momentum?
[1 markah / 1 mark]
(b) (i) Berdasarkan Rajah 4.1, bandingkan momentum bola P dan bola Q.
Based on Diagram 4.1, compare the momentum of ball P and ball Q.
[1 markah / 1 mark]
(ii) Berdasarkan Rajah 4.2, bandingkan momentum bola P dan bola Q.
Based on Diagram 4.2, compare the momentum of ball P and ball Q.
[1 markah / 1 mark]
(iii) Berdasarkan Rajah 4.1 dan Rajah 4.2, bandingkan jumlah momentum sebelum perlanggaran dan
selepas perlanggaran. Nyatakan prinsip yang terlibat dan jenis perlanggaran tersebut.
Based on Diagram 4.1 and Diagram 4.2, compare the total momentum before and after collision. State the principle involved and
the type of collision.
[3 markah / 3 marks]
(c) Rajah 4.3 menunjukkan pemain golf menghayun kayu golf dengan daya penuh. Aksi ini dinamakan 'ikut
lajak'.
Diagram 4.3 shows a golfer swinging a golf club with full force. This action is called 'follow through'.












Rajah 4.3 / Diagram 4.3
Dengan mengaplikasi konsep fizik, terangkan bagaimana 'ikut lajak' boleh meningkatkan jarak pukulan
bola.
By applying physics concepts, explain how 'follow through' can increase the distance of the ball.
[4 markah / 4 marks]




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02 HYBRID PBD FIZIK F4.indd 60 05/11/2021 8:20 AM

Fizik Tingkatan 4 Bab 2

(d) Rajah 4.4 menunjukkan seorang atlet dalam pertandingan berbasikal di atas jalan raya. Anda dikehendaki
memberi beberapa cadangan untuk membolehkan atlet tersebut dapat mengayuh basikal dengan
halaju yang lebih tinggi secara lebih selamat.
Diagram 4.4 shows an athlete in a road cycling competition. You are required to give some suggestions to enable the athlete to ride the
bike at a higher speed more safely.





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Rajah 4.4 / Diagram 4.4
Menggunakan pengetahuan anda tentang daya, gerakan dan sifat-sifat bahan, terangkan cadangan
anda berdasarkan aspek-aspek berikut.
Using your knowledge of force, motions and properties of materials, describe your suggestions based on the following aspects.
(ii) Jisim basikal
The mass of the bicycle
(ii) Jenis bahan bagi badan basikal
The type of material for the body of the bicycle
(ii) Lebar tayar yang bersentuhan dengan permukaan jalan
The width of tyre in contact with the road surface
(ii) Pakaian atau kelengkapan penunggang basikal itu
The attire or accessories of the cyclist
[10 markah / 10 marks]




























Kuiz 2





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02 HYBRID PBD FIZIK F4.indd 61 05/11/2021 8:20 AM

Fizik Tingkatan 4 Bab 2
FOKUS KBAT








Raqib dan Amir merupakan pelari terakhir dalam acara 4 x 100 m bagi dua TIP Menjawab
pasukan yang berbeza. Semasa Raqib memulakan lariannya, Amir sudah berada
20 meter di hadapannya dan sedang berlari dengan halaju seragam 7.2 m s . Bandingkan masa kedua-dua
–1
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Raqib and Amir were the last runner in the 4 x 100 m event for two different teams. When Raqib pelari menamatkan perlumbaan
started his run, Amir was already 20 metres in front of him and was running with a uniform velocity of bermula dari saat Raqib
7.2 m s . memulakan larian. Pelari yang
–1
mengambil masa yang lebih
Raqib memulakan larian dengan memecut 3 m s selama 4 saat dan kemudian singkat adalah pemenang.
–2
meneruskan larian dengan halaju seragam sehingga ke garisan penamat. Compare the time the two runners
Raqib starts the run by accelerating 3 m s for 4 seconds and then continue the run with uniform finished the race starting from the
–2
velocity all the way to the finish line. moment Raqib started the run. The
runner who takes the shorter time is
Siapakah yang terlebih dahulu tiba di garisan penamat? the winner.
Who arrives at the finish line first? KBAT Mengaplikasi KBAT Menganalisis
Larian Amir / Amir's run:
Masa menamatkan larian = sesaran = 100 – 20 = 11.11 s
halaju 7.2
displacement 100 – 20
Time to finish the run = velocity = 7.2 = 11.11 s



Larian Raqib (4 saat pertama) / Raqib's run (First 4 seconds):
v = u + at = 0 + (3)(4) = 12 m s –1
v = u + 2 as
2
2
12 = 0 + 2(3)s
2
2
s = 24 m
Larian Raqib (selepas 4 saat) / Raqib's run (after 4 seconds):

Masa / Time = sesaran / displacement = 100 – 24 = 6.83 s
halaju / velocity 12

Jumlah masa Raqib menamatkan larian / Total time Raqib finished the run
= 4 + 6.83 = 10.83 s

Pelari Jumlah masa menamatkan larian
Runner Total time to finish the run
Amir 11.11 s
Raqib 10.83 s


Oleh itu, Raqib terlebih dahulu tiba di garisan penamat berbanding Amir.
So, Raqib arrived at the finish line earlier than Amir.





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