14.5.19

2A12m - keseimbangan daya melibatkan daya geseran

8
Table below shows three types of remote control toy car and their characteristics.
Jadual di bawah menunjukkan tiga jenis kereta mainan kawalan jauh dan ciri-cirinya.


Types of toy car
Jenis kereta mainan
Tyre diameter
Diameter tayar
Mass
Jisim
Voltage of battery used
Voltan bateri  yang digunakan
Kereta mainan A
4.0 cm
1.3 kg
9.0V
Kereta mainan B
4.0 cm
2.5 kg
9.0V
Kereta mainan C
4.0 cm
1.7 kg
9.0V



(a)
(i)
Based on  Table above, which toy car is the most difficult to start  moving?
Berdasarkan Jadual di atas, kereta mainan yang manakah paling sukar untuk mula bergerak?







[ 1 mark/ markah]



(ii)
Give one reason for the answer in 8a(i) and state the relationship between the reason and physics concept involved.
Berikan satu sebab kepada jawapan di 8a(i) dan nyatakan hubungan di antara sebab dan konsep fizik yang terlibat.















[ 2 marks/ markah]



(b)
Diagram below shows Sarah is pushing a 5.0 kg box with difference force on three type of rough surface of wooden plane, P,Q and R.
Rajah di bawah menunjukkan Sarah sedang menolak kotak 5.0 kg dengan daya-daya yang berbeza di atas permukaan kasar satah kayu, P,Q dan R.






Table diagram shows the magnitude accelerations, a and force applied, F to push the box on each surface of wooden plane.
Jadual di atas menunjukkan magnitude pecutan, a dan daya F yang digunakan untuk menolak kotak tersebut di atas setiap permukaan satah kayu.



Wooden plane
Satah kayu
P
Q
R
Acceleration, a
Pecutan ,a(ms-2)
4.0
2.5
4.5
Force,F
Daya, F(N)
50.0
40.0
30.0





(i)
What is meaning of frictional force?
Apakah yang dimaksudkan dengan daya geseran?







[ 1 mark/ markah]



Calculate the friction force of each surface of wooden plane.
Hitung daya geseran untuk setiap permukaan satah kayu.



(ii)
Wooden plane P
Satah kayu P











[ 2 marks/ markah]


(iii)
Wooden plane Q
Satah kayu Q















[ 1 mark/ markah]






(iv)
Wooden plane R
Satah kayu R















[ 1 mark/ markah]

(c)
From question 8 b) Determine the most suitable surface of wooden plane to build a slide at children’s playgrounds. Give a reason.
Berdasarkan soalan 8 b) Tentukan permukaan satah yang paling sesuai untuk membina gelongsor taman permainan kanak-kanak. Berikan satu sebab.














[ 2 marks/ markah]

(d)
State two modifications that can be done to reduce the friction of the slide.


Nyatakan  dua pengubahsuaian yang boleh dilakukan untuk mengurangkan geseran slaid.








[ 2 marks/ markah]

JAWAPAN: 


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