8
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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.
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Types
of toy car
Jenis
kereta mainan
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Tyre
diameter
Diameter
tayar
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Mass
Jisim
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Voltage
of battery used
Voltan
bateri yang digunakan
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Kereta
mainan A
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4.0
cm
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1.3
kg
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9.0V
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Kereta
mainan B
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4.0
cm
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2.5
kg
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9.0V
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Kereta
mainan C
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4.0
cm
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1.7
kg
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9.0V
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(a)
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(i)
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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?
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[ 1 mark/ markah]
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(ii)
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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.
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[
2 marks/ markah]
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(b)
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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.
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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.
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Wooden plane
Satah
kayu
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P
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Q
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R
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Acceleration, a
Pecutan ,a(ms-2)
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4.0
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2.5
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4.5
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Force,F
Daya, F(N)
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50.0
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40.0
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30.0
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(i)
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What
is meaning of frictional force?
Apakah
yang dimaksudkan dengan daya geseran?
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[
1 mark/ markah]
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Calculate
the friction force of each surface of wooden plane.
Hitung
daya geseran untuk setiap permukaan satah kayu.
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(ii)
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Wooden
plane P
Satah
kayu P
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[ 2
marks/ markah]
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(iii)
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Wooden
plane Q
Satah
kayu Q
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[
1 mark/ markah]
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(iv)
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Wooden
plane R
Satah
kayu R
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[
1 mark/ markah]
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(c)
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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.
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[ 2
marks/ markah]
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(d)
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State
two modifications that can be done to reduce the friction of the slide.
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Nyatakan dua pengubahsuaian yang boleh dilakukan untuk mengurangkan geseran slaid.
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[
2 marks/ markah]
JAWAPAN:
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