SKEMA JAWAPAN FIZIK (PPT)TINGKATAN 4 2015KERTAS 11D26D

2D27C

3D28B

4C29A

5D30A

6A31B

7D32D

8B33C

9C34A

10A35D

11C36B

12B37C

13D38D

14C39C

15B40D

16D41B

17A42B

18B43A

19A44A

20A45A

21D46D

22A47D

23B48C

24A49D

25B50B

KERTAS 21 (a)(i)0.01 cm 1

(ii)0.34 cm 1

(b)(i)-0.02 mm 1

(ii)1.68 mm 14

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 jikaDalam gerakan cenderung untuk kekalkan gerakan melainkan dikenakan keatasnya suatu daya luar.

1

(c)Increase Bertambah1

(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. 16

3(a)Gravitational force // weightAir resistance // frictional force11

(b)(i)Velocity decreases until becomes constant // acceleration decreases until becomes zero1

(ii)Plastic ball1

(c)Less air resistance // higher speed // smaller space area1

(d)Same velocity // same speed // same acceleration // acceleration 9.8 // 10 ms-21

6

4(a)Velocity constant and then velocity increase1

(b)(i)ZeroVelocity constant11

(c)6 = v = 0.6 ms-1

11

(d)8 = t = 26.7 s

11

7

5(a)Product of mass and velocity1

(b)(i)5.1 > 5.2 / vice-versa1

(ii)5.2 > 5.1 / vice-versa1

(iii)Same1

(iv)Higher mass, lower speed1

(c)Same / 0 / zero1

(d)Principle of conservation of momentum / explosion1

(e)Increase1

8

6(a)Rate of change of momentum Terima jika beri rumus dengan memberi maksud kepadasetiap simbol1

(b)(i)Diagram 5.1 > Diagram 5.2 // vice-versa1

(ii)Diagram 5.1 < Diagram 5.2 // vice-versa1

(iii)Diagram 5.1 > Diagram 5.2 // vice-versa1

(c)(i)When time (of contact) decreases, displacement (of theball) increases1

(ii)When change of momentum is increases, the displacement (of the ball) increases1

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

1

(ii)F directly proportional to (mv mu) / change ofmomentum // F change of momentum1

8

7(a)580 N1

(b)R = mg + F/ R = mg F1

(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 studentDaya tindakbalas normal, R yang ditunjukkan pada bacaan adalah hasil tambah berat pelajar, W dan daya paduan, F yang bertindak ke atas pelajar1

(d)(i)The reading of the weighing scale decreasesBacaan penimbang berkurang1

Normal reaction force, R = Weight, W Resultant force, F Daya tindak balas normal, R = Berat, W Daya paduan, F1

(e)1.At restPada keadaan rehat

2.Moves up or down at a constant velocityBergerak ke atas atau ke bawah dengan halaju malar

1

1

(f)(i)free fall / jatuh bebas1

(ii)9.81 ms-1 // 10 ms-11

(iii)zero / sifar110

8(a)The capacity to do work1

(b)1

1

(c)Kinetic energy potential energy kinetic energy2

(d)1) bigger force - ball has more kinetic energy/ momentum2) heavier golf club/ raise the golf club higher/ bigger angle - more energy is transferred to the golf club2

2

(e)

- Angle of projection or any suitable answer110

Markah

9(a)(i )Base quantity is a quantity that cannot be defined by another physical quantity1

(ii)1.Both clocks used a physical process which repeats at the same rate2.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)111

(iii)1.Perubahan panjang baying-bayang dengan masa adalah tidak konsisten2.Kaedah panjang bayang-bayang hanya sesuai pada siang hari dengan hari yang cerah3.Tidak dapat mengukur sela masa yang singkat4.Kadar kejatuhan pasir bergantung kepada tekanan pasir pada leher yang sempit itu5. 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 semula11

11

1

1

(c)SuggestionsReason

Digital time screenThe scale is easy to read

Have a reset systemThe 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 resistantNot easy to rust/ can be used longer period

The material has low densityLight/ portable/ easy to carry

Battery is used as the power sourceCan be used for a longer period/ Avoid mechanical disfunction

The system is free from surrounding effectCan be used at all time/ weather

TOTAL

22

2

22

2

20

Markah

10(a)(i )Rate of change of velocity1

(ii)1.The mass of the load in both diagram is the same2.The net force acted on the carriage in diagram 10.2 is bigger than in diagram 10.13.The acceleration of the carriage in diagram 10.2 is more than in diagram10.14.The bigger the force , the higher the acceleration5. Newtons Second Law11111

(b)1.Pada lintasan garis melengkung gerakan sentiasa berubah2.Halaju akan sentiasa berubah3.Halaju berubah , maka pecutan bukannya sifar4.Oleh itu terdapat daya bersih yang dialami oleh objek 1111

(c)SuggestionsReason

Smooth surface body / coat with waxReduce friction of body towards water

Streamline/aerodynamic shape of bodyReduce water resistance

Low density material Lighter/easier to float/easy to carry and sail faster

Wider paddle surfaceGreater force because more water are paddle out

Strong material body and paddleNot easily broken / longlasting

Wear safety jacketPassenger can float and safe if they fall into water

22

2

22

2

11(a)Tenaga yang dipindahkan kepada spring dan disimpan1 m

(b)(i)Gravitational potential energy kinetic energy elastic potential energyTenaga keupayaan gravity tenaga kinetic tenaga keupayaan kenyal1 m

(ii)Molekul-molukel pepejal menjadi lebih dekat antara satu sama lainDaya tolakan yang kuat bertindak antara molekul untuk menentang mampatan ituApabila daya dialihkan ,daya tolakan yang kuat menyebabkan molekul-molekul kembali kepada kedudukan asalnya1m1m1m

(c )Characteristics/ciri-ciri Explanation/Penerangan

Wire of spring should be thicker/Wayar spring perlu tebalSpring will not easily break/Spring tidak mudah patah

Arrangement of the spring must be parallel/Susunan spring mestilah selariThe spring will more stiffer/Spring akan lebih keras

Force constant must be larger/Pemalar daya mestilah besarThe spring will stiffer and not 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

2m

2m

(d)(i)k=F/xk=30/(15 x10-2)k=200 Nm-1 tanpa unit1m1m

(ii)Ep= kx2Ep= (200)(12 x 10-2)2 tunjukkan tukaran unit cm kepada mEp=2.88 J@Nm betul dengan unit2m1m

Q 12AnswerMark

(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 diameterEnough space to the spring to be install

More than 1000 NCan support heavy load

Higher spring constantSmall compression of the spring

Small natural frequencyReduce bumping

D is choosed, small diameter, highest elastic limit, higher spring constant, small natural frequency

10

(c)i) Product of mass and velocity1

ii) P = mv = (80)(100) = 8 x 103 g ms-111

iii) Velocity decrease1

iv) To increase time impact // to reduce impulsive force1

TOTAL5