SMK DATO ABDUL RAHMAN YAAKUB, BOTA KANAN, 32600 BOTA, PERAKFizik

PEPERIKSAAN PERTENGAHAN TAHUN 2014 April 2014 1 Jam 30 MinNama Pelajar: Kelas: Markah :

Section ABahagian A

[ 28 marks ][ 28 markah ]

Answer all questions in this section.Jawab semua soalan dalam bahagian ini.

1 A student carries out an experiment to investigate the relationship between the period of oscillation, T, and the mass of the load, m, of a spring.The results of the experiment are shown in the graph of T2 against m in Diagram below.Seorang murid menjalankan eksperimen untuk menyiasat hubungan antara tempoh ayunan, T, dengan jisim beban m, bagi sebuah spring.Keputusan eksperimen ini ditunjukkan oleh graf T2 melawan m dalam Rajah di bawah.

1

0.050

0.25

0.50

0.75

1.00

1.25

1.50

0.10 0.15 0.20 0.25 0.30

T / s Graph of T against mGraf T melawan m

m / kg

2 22

2

(a) Based on the graph in Diagram above:Berdasarkan graf pada Rajah di atas:

(i) State the relationship between T2 and m.Nyatakan hubungan antara T2 dengan m.

[ 1 mark/ markah]

(ii) Determine the value T when m = 0.30 kg.Show on the graph, how you determine the value of T.Tentukan nilai T apabila m=0.30 kgTunjukkan pada graf itu bagaimana anda menenukan nilai T.

T = s[ 3 marks/ markah]

(iii) Calculate the gradient, h, of the graph.Show on the graph how you calculate h.

2

Hitungkan kecerunan graf,h, bagi graf itu.Tunjukkan pada graf itu bagaimana anda menghitung h.

h= s2 kg-1

[ 3 marks/ markah]

(b)

The spring constant, k, is give by the formula k=,4

h

where h is the gradient

of the graph and =3.14Calculate the value of k.

Pemalar spring k, diberi oleh formula k=,4

h

dengan keadaan h ialah

kecerunan graf dan =3.14Hitung nilai k.

K= [ 2 marks/ markah]

(c) The relationship between energy stored in the spring, E, and the spring constant,

k, is E=kx

21

2, where x is the extension of the spring.Using the answer in (b), calculate the energy stored in the spring when x=0.10m.Hubungan antara tenaga yang tersimpan di dalam spring, E, dengan pemalar

spring, k, ialah Ekx

21

2, dengan keadaan x ialah pemanjangan spring.Menggunakan jawapan di (b), hitung tenaga yang tersimpan di dalam spring itu apabila x = 0.10m.

3

E= [ 2 marks/ markah]

(d) State one precaution that should be taken to improve the accuracy of the result of this experiment.Nyatakan satu langkah berjaga-jaga yang perlu diambil untuk meningkatkan kejituan bacaan dalam eksperimen ini.

[ 1 mark/ markah]

END OF QUESTION PAPER KERTAS SOALAN TAMAT

ANSWER

1 (a) (i)

(ii)

(iii)

T2 increases linearly with m//T2 increases, m increases

- draw the extrapolation line and show the vertical line corresponding to m=0.30- state the value of T2 (within range 1.45-1.50)- determine the value of T(within range 1.30-1.22)

– draw a sufficiently large triangle/ 3×3 correct substitution (follow candidate’s triangle)

25.020.025.1

// corresponding values

4.2(within range 4.1 to 4.3)

11

111

1

1

(b)2.414.34

(e.c.f)(a)(iii)

2.99kg s-2 (with range 2.92-3.06)

1

1

4

(c)

E= 21

×2.99×0.12

= 0.015J

1

1(d) - do not exceed the elastic limit of the spring

- position of the eyes must be aligned with the scale on the stopwatch

- repeat the experiment and take the average reading

1

12

5