SKEMA JAWAPAN FIZIK (PPT/PPDJJ)

TINGKATAN 4 2015

KERTAS 1

1 D 26 D

2 D 27 C

3 D 28 B

4 C 29 A

5 D 30 A

6 A 31 B

7 D 32 D

8 B 33 C

9 C 34 A

10 A 35 D

11 C 36 B

12 B 37 C

13 D 38 D

14 C 39 C

15 B 40 D

16 D 41 B

17 A 42 B

18 B 43 A

19 A 44 A

20 A 45 A

21 D 46 D

22 A 47 D

23 B 48 C

24 A 49 D

25 B 50 B

KERTAS 2

1 (a) (i) 0.01 cm 1

(ii) 0.34 cm 1

(b) (i) -0.02 mm 1

(ii) 1.68 mm

1 4

2 (a) time taken for 1 complete oscillation.

Masa untuk satu ayunan lengkap.

1

(b)

an object at rest tends to stay at rest, and if in motion tends to stay in

motion unless acted upon by an external force.

Suatu objek yang dalam keadaan rehat cenderung untuk kekal dalam

keadaan rehat, dan jika

Dalam gerakan cenderung untuk kekalkan gerakan melainkan dikenakan

1

keatasnya suatu daya luar.

(c) Increase

Bertambah

1

(d)

The larger the mass, the larger the inertia.

Jisim bertambah, inersia bertambah.

1

(e)

(i) any reasonable answer. Eg ;chlli sauce in bottle can force out by

sudden stop of the bottle.

Semua jawapan yang berkaitan boleh diterima.

1

(ii) air bag, seat belt.

Beg udara, tali pinggang keledar. Dan jawapan lain yang

munasabah.

1 6

3 (a) Gravitational force // weight

Air resistance // frictional force

1

1

(b) (i) Velocity decreases until becomes constant // acceleration

decreases until becomes zero

1

(ii) Plastic ball

1

(c) Less air resistance // higher speed // smaller space area 1

(d) Same velocity // same speed // same acceleration // acceleration

9.8 // 10 ms-2

1

6

4 (a) Velocity constant and then velocity increase 1

(b) (i) Zero

Velocity constant

1

1

(c) 𝑠 =

1

2 (𝑢 + 𝑣)𝑡

6 = 1

2 (0 + 𝑣)20

v = 0.6 ms-1

1

1

(d) 𝑠 =

1

2 (𝑢 + 𝑣)𝑡

8 = 1

2 (0.6 + 0)𝑡

t = 26.7 s

1

1

7

5 (a) Product of mass and velocity 1

(b) (i) 5.1 > 5.2 / vice-versa 1

(ii) 5.2 > 5.1 / vice-versa

1

(iii) Same 1

(iv) Higher mass, lower speed 1

(c) Same / 0 / zero 1

(d) Principle of conservation of momentum / explosion 1

(e) Increase 1

8

6 (a) Rate of change of momentum

Terima jika beri rumus dengan memberi maksud kepada

setiap simbol

1

(b) (i) Diagram 5.1 > Diagram 5.2 // vice-versa 1

(ii) Diagram 5.1 < Diagram 5.2 // vice-versa

1

(iii) Diagram 5.1 > Diagram 5.2 // vice-versa 1

(c) (i) When time (of contact) decreases, displacement (of the

ball) increases

1

(ii) When change of momentum is increases, the

displacement (of the ball) increases

1

(d) (i) F inversely proportional to t // F ∝ 1

𝑡

1

(ii) F directly proportional to (mv – mu) / change of

momentum // F ∝ change of momentum

1

8

7 (a) 580 N 1

(b) R = mg + F/ R = mg − F 1

(c) The normal reaction force, R shown on reading is the sum of the

weight of the student, W and the resultant force, F on the student

Daya tindakbalas normal, R yang ditunjukkan pada bacaan adalah

hasil tambah berat pelajar, W dan daya paduan, F yang bertindak ke

atas pelajar

1

(d) (i) The reading of the weighing scale decreases

Bacaan penimbang berkurang

1

Normal reaction force, R = Weight, W − Resultant force, F

Daya tindak balas normal, R = Berat, W – Daya paduan, F

1

(e) 1. At rest

Pada keadaan rehat

2. Moves up or down at a constant velocity

Bergerak ke atas atau ke bawah dengan halaju malar

1

1

(f) (i) free fall / jatuh bebas 1

(ii) 9.81 ms-1 /

/ 10 ms-1

1

(iii) zero / sifar 1 10

8 (a) The capacity to do work 1

(b)

1

1

(c) Kinetic energy » potential energy » kinetic energy 2

(d) 1) bigger force

- ball has more kinetic energy/ momentum

2) heavier golf club/ raise the golf club higher/ bigger angle

- more energy is transferred to the golf club

2

2

(e) - Angle of projection or any suitable answer 1 10

Markah

9 (a) (i ) Base quantity is a quantity that cannot be defined by another physical

quantity

1

(ii)

1.Both clocks used a physical process which repeats at the same rate

2.The sun clock is build based on the changes of length of shadow

3.The sand clock is build based on the dropping of sand through narrow

neck in the glass container

(accept similar answer)

1

1

1

(iii) 1.Perubahan panjang baying-bayang dengan masa adalah tidak konsisten

2.Kaedah panjang bayang-bayang hanya sesuai pada siang hari dengan hari

yang cerah

3.Tidak dapat mengukur sela masa yang singkat

4.Kadar kejatuhan pasir bergantung kepada tekanan pasir pada leher yang

sempit itu

5. Tekanan pasir pula bergantung kepada kuantiti pasir yang berada pada

leher sempit

6.Sukar mengukur untuk masa yang panjang, contohnya satu hari @ perlu

diterbalikkkan oleh manusia untuk diguna semula

1

1

1

1

1

1

(c)

Suggestions Reason

Digital time screen The scale is easy to read

Have a reset system The measurement can be repeated

The period of

oscillation/mechanical recurrence

is consistent

The precision will be increased

The material used to make the

body is water resistant

Not easy to rust/ can be used

longer period

The material has low density Light/ portable/ easy to carry

Battery is used as the power source Can be used for a longer period/

Avoid mechanical disfunction

The system is free from

surrounding effect

Can be used at all time/ weather

TOTAL

2

2

2

2

2

2

20

Markah

10 (a) (i ) Rate of change of velocity 1

(ii) 1.The mass of the load in both diagram is the same

2.The net force acted on the carriage in diagram 10.2 is bigger than in

diagram 10.1

3.The acceleration of the carriage in diagram 10.2 is more than in

diagram10.1

4.The bigger the force , the higher the acceleration

5. Newton’s Second Law

1

1

1

1

1

(b)

1.Pada lintasan garis melengkung gerakan sentiasa berubah

2.Halaju akan sentiasa berubah

3.Halaju berubah , maka pecutan bukannya sifar

4.Oleh itu terdapat daya bersih yang dialami oleh objek

1

1

1

1

(c)

Suggestions Reason

Smooth surface body / coat with

wax

Reduce friction of body towards

water

Streamline/aerodynamic shape of

body

Reduce water resistance

Low density material Lighter/easier to float/easy to carry

and sail faster

Wider paddle surface Greater force because more water

are paddle out

Strong material body and paddle Not easily broken / longlasting

Wear safety jacket Passenger can float and safe if they

fall into water

2

2

2

2

2

2

11 (a) Tenaga yang dipindahkan kepada spring dan disimpan 1 m

(b) (i) Gravitational potential energy kinetic energy elastic potential

energy

Tenaga keupayaan gravity tenaga kinetic tenaga keupayaan

kenyal

1 m

(ii) Molekul-molukel pepejal menjadi lebih dekat antara satu sama lain

Daya tolakan yang kuat bertindak antara molekul untuk menentang

mampatan itu

Apabila daya dialihkan ,daya tolakan yang kuat menyebabkan molekul-

molekul kembali kepada kedudukan asalnya

1m

1m

1m

(c )

Characteristics/ciri-ciri Explanation/Penerangan

Wire of spring should be thicker/

Wayar spring perlu tebal

Spring will not easily break/

Spring tidak mudah patah

Arrangement of the spring must be

parallel/

Susunan spring mestilah selari

The spring will more stiffer/

Spring akan lebih keras

Force constant must be larger/ The spring will stiffer and not

2m

2m

Pemalar daya mestilah besar easily break/

Spring akan lebih keras dan tidak

mudah rosak

Diameter of coil of spring should

be small/

diameter gegelung spring mestilah

kecil

Less elastic the spring/

Kekenyalan spring kurang

The most suitable spring is Q because its wire of spring

thick,arrangement of spring parallel,big force constan and small diameter

of coil of spring/

Spring yang paling sesuai adalah Q kerana wayar spring tebal, susunan

spring selari,pemalar daya besar dan diameter gegelung spring kecil.

2m

2m

2m

(d) (i) k=F/x

k=30/(15 x10-2

)

k=200 Nm-1

tanpa unit

1m

1m

(ii) Ep= 1

2 kx

2

Ep=1

2 (200)(12 x 10

-2)2 tunjukkan tukaran unit cm kepada m

Ep=2.88 J@Nm betul dengan unit

2m

1m

Q 12 Answer Mark

(a) Attraction and repulsive force between the particle of the solid

When its stretched, the molecule away from each other

Attractive force are acting to oppose the stretching

When the solid is compressed, the molecules becomes closer to each

other

Repulsive force are acting to oppose the compression.

5

(b) Small diameter Enough space to the spring to

be install

More than 1000 N Can support heavy load

Higher spring constant Small compression of the

spring

Small natural frequency Reduce bumping

D is choosed, small diameter, highest elastic limit, higher

spring constant, small natural frequency

10

(c) i) Product of mass and velocity 1

ii) P = mv

= (80)(100)

= 8 x 103 g ms

-1

1

1

iii) Velocity decrease 1

iv) To increase time impact // to reduce impulsive force 1

TOTAL 5