Diagram A
and Diagram B show two identical mirrors which are hung on the wall
using strings, of the same length.
Rajah A dan Rajah B menunjukkan dua
cermin yang serupa digantung pada dinding menggunakan tali yang sama panjang.
Diagram A
Diagram B
Rajah A Rajah B
The
two mirrors are in equilibrium state. Each mirror has a mass of 2 kg. Each
string can withstand a maximum force of 15 N.
Kedua-dua cermin itu berada dalam keadaan keseimbangan. Jisim bagi setiap
cermin ialah 2 kg. Setiap tali itu boleh menampung daya
maksimum 15 N.
(a)
|
What
is meant by equilibrium state?
Apakah maksud keadaan keseimbangan?
______________________________________________________________________________
[1 mark]
[1 markah]
|
(b)
|
What
is the weight of any one of the mirrors?
Berapakah berat mana-mana satu cermin itu?
______________________________________________________________________________
[1 mark]
[1 markah]
|
(c)
|
In the space below, draw a diagram of a
triangle of forces that acts on the mirrors in Use
Diagram A and Diagram B.
Pada ruang di bawah, lukis rajah segitiga keseimbangan daya bagi
tindakan daya ke atas
cermin dalam Rajah A dan Rajah B.
|
Diagram of a triangle of forces for Diagram A
Rajah segitiga keseimbangan
daya untuk Rajah A
|
Diagram of a triangle offorces for Diagram B
Rajah segitiga keseimbangan
daya untuk Rajah B
|
[2 markah]
|
(d
|
T1
and T2 are the tensions of the strings that act on the mirrors in
Diagram A and Diagram B respectively.
T1 dan T2 masing-masing ialah daya tegangan tali
yang bertindak ke atas cermin dalam Rajah A dan
Rajah B.
(i)
|
In the space below, draw the scale
drawings of the triangles of forces to determine the values of T1 and T2.
Pada ruang di bawah, lukis lukisan berskala segitiga keseimbangan daya
untuk menentukan nilai T1 danT2.
[Use the scale 1 cm : 2 N]
[Gunakan skala 1 cm : 2 N]
T1 =
.................. cm
=
.................... N
T2 =
.................. cm
=
.................... N
[4 marks]
[4 markah]
|
(ii)
|
Based on your answer in (d)(i), which is the most suitable method
to hang the mirror? Give one reason for your answer.
Berdasarkan jawapan di (d)(i), kaedah menggantung
cermin yang manakah paling sesuai? Beri satu sebab bagi
jawapan anda.
____________________________________________________________________________
[2 marks]
[2 markah]
)
|
|
(e)
|
If
the string in Diagram A is cut, the mirror will fall down in 0.6 s.
Calculate the final velocity of the mirror before it touches the surface of
the floor.
Jika tali pada Rajah A dipotong, cermin itu akan jatuh
ke lantai dalam masa 0.6 s.
Hitung halaju akhir cermin itu sebelum menyentuh permukaan lantai.
[2 marks]
|
|
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