# form 4 (chapter 2 force & motion).pdf

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• 7/23/2019 Form 4 (Chapter 2 Force & Motion).pdf

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Physics

(4531)

Freda Phang Li Lee

SPM

Physics (4531)

Modul Berfokus Peningkatan

Prestasi Fizik SPM Pulau Pinang2015

NAME: .

CLASS/ SCHOOL:

..............................

• 7/23/2019 Form 4 (Chapter 2 Force & Motion).pdf

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PHYSICS MODULE SPM 2015 PANELS

SMK Seri Nibong

PHANG LI LEE

SMJK Chung Hwa Confucian

CHU MAW PING

SMK Air Itam

SMK Taman Widuri

NORAINI BT ITHNIN

SM Sains Kepala Batas

SMK Telok Bahang

SMKA Nibong Tebal

NORAZIMAH BT MASIDI

SMK Gemilang

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1.(S)

Diagram 1 shows a boy jumping from a high position.

Rajah 1 menunjukkan seorang budak lelaki sedang terjun dari tempat yang tinggi.

Diagram 1 /Rajah 1

a) i) What will the boy do before reaching the floor? [1 mark]

Apakah budak itu akan buat semasa mendarat di atas lantai? [1 markah]

_________________________________________________________________

ii) Give a reason for (a)(i). [2 marks]

Beri sebab untuk (a)(i). [2 markah]

_________________________________________________________________

_________________________________________________________________

b) The mass of the boy is 60 kg. His velocity upon reaching the floor is 5 ms 1

and he

stops in 0.3 s.

Jisim budak itu 60 kg. Halajunya bila menyentuh lantai ialah 5 ms 1 dan dia

berhenti dalam 3 saat.

Calculate the impulsive force exerted on the boy. [3 marks]

Hitung daya impuls yang bertindak ke atas budak itu. [3 markah]

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2.(R,S,T)

Diagram 2 shows an electric motor lifting a 2.0 kg load. When the motor is switched on, the

load moved through a height of 1.5 m in 2.5 s with constant speed. The current flowing in the

circuit is 1.7 A and the potential difference across the motor is 10.0 V.

Rajah 2 menunjukkan sebuah motor elektrik sedang mengangkat satu beban 2.0 kg. Apabila

motor itu dihidupkan, beban itu bergerak melalui ketinggian 1.5 m dalam 2.5 s dengan laju

malar. Arus yang mengalir dalam litar ialah 1.7 A dan beza keupayaan merentasi motor itu

ialah 10.0 V.

Diagram 2 /Rajah 2

(a) State the changes in energy that occur when the motor is switched on. [1 mark]

Nyatakan perubahan tenaga yang berlaku apabila motor itu dihidupkan.

[1 markah]

________________________________________________________________

(b) Calculate,

Hitung,

(i) the electrical power supplied when the motor is lifting the load. [2 marks]

kuasa elektrik yang dibekalkan semasa motor itu mengangkat beban.

[2 markah]

(ii) the output power of the motor when the load moved through a height of 1.5 m in

2.5 s. [2 marks]

kuasa output motor apabila beban itu melalui ketinggian 1.5 m dalam 2.5 s.

[2 markah]

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(iii) the efficiency of the electric motor. [2 marks]

kecekapan motor itu. [2 markah]

(c) If some of the load is removed while the motor is still lifting the load, what change

Jika sebahagian daripada beban dikeluarkan semasa motor itu mengangkat beban,

[2 markah]

__________________________________________________________________

__________________________________________________________________

(d) Suggest one way to increase the efficiency of the motor. [1 mark]

Cadangkan satu cara untuk menambah kecekapan motor itu. [1 markah]

__________________________________________________________________

3.(R,S,T)

Diagram 3.1 shows a stationary pistol on a smooth surface.

Diagram 3.2 shows the pistol and bullet after the pistol has been fired by remote control.

Rajah 3.1 menunjukkan sebuah pistol pegun di atas permukaan licin.

Rajah 3.2 menunjukkan pistol dan peluru selepas tembakan dilepaskan secara kawalan jauh.

Diagram 3.1 /Rajah 3.1

Diagram 3.2 /Rajah 3.2

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(a) (i) What is the meaning of momentum? [1 mark]

Apakah maksud dengan momentum? [1 markah]

_________________________________________________________________

(ii) State the total momentum of the pistol and bullet in Diagram 3.1.

Using Diagram 3.1 and Diagram 3.2, compare the total momentum before and after

the bullet is fired.

Using Diagram 3.2, compare the magnitude and direction of the momentum of the

bullet and pistol.

Name the physics principle that can be applied to the motion of the bullet and

pistol. [5 marks]

Menggunakan Rajah 3.1 dan Rajah 3.2, bandingkan jumlah momentum sebelum

dan selepas peluru itu ditembak.

Menggunakan Rajah 9.2, bandingkan magnitud dan arah momentum peluru dan

pistol.

Nyatakan prinsip fizik yang boleh diaplikasi kepada gerakan peluru dan pistol itu.

[5 markah]

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

(b) Describe, in terms of momentum, the propulsion of a rocket engine. [4 marks]

Terangkan, dalam sebutan momentum, rejangan sebuah enjin roket. [4 markah]

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

___________________________________________________________________

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(c) Diagram 3.3 shows the structure of a jet engine for a small jet plane.

Rajah 3.3 menunjukkan struktur sebuah enjin jet bagi sebuah kapal terbang jet

yang kecil.

Diagram 3.3 /Rajah 3.3

You are required to give some suggestions to improve the design of the jet engine so

that it can be used on a larger jet plane that travels at a higher speed.

Using the knowledge on forces and motion and the properties of materials, explain

the suggestions based on the aspects labelled on Diagram 3.3. [10 marks]

Anda dikehendaki memberi beberapa cadangan untuk membaiki reka bentuk enjin

jet itu supaya enjin jet itu boleh digunakan pada sebuah kapal terbang jet yang lebih

besar dan bergerak lebih laju.

Menggunakan pengetahuan tentang gerakan, daya dan sifat-sifat bahan, terangkan

[10 markah]

Suggestions Reasons

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4.(R,S,T)

Diagram 4.1(a) shows an empty pickup truck. Diagram 4.1(b) shows the same pickup truck

carrying a crate.

pengangkut yang sama membawa kontena barangan.

Diagram 4.1 /Rajah 4.1

(a) What is meant by inertia? [1 mark]

Apakah yang dimaksudkan dengan inertia? [1 markah]

__________________________________________________________________

(b) Compare the mass of the pickup truck in Diagram 4.1(a) with the total mass of the

pickup truck and crate in Diagram 4.1(b). [1 mark]

Bandingkan jisim lori pengangkut dalam Rajah 4.1(a) dengan jisim lori pengangkut

beserta kontena barangan dalam Rajah 4.1(b). [1 markah]

__________________________________________________________________

__________________________________________________________________

(c) Compare the inertia of pickup truck in Diagram 4.1(a) with inertia of pickup truck

and crate in Diagram 4.1(b). [1 mark]

Bandingkan inertia lori pengangkut dalam Rajah 4.1(a) dengan inertia lori

pengangkut dan kontena barangan dalam Rajah 4.1(b). [1 markah]

__________________________________________________________________

__________________________________________________________________

(d) When pickup truck in Diagram 4.1(b) suddenly moves forwards, the crate will move

backwards. Explain why. [1 mark]

Apabila lori pengangkut dalam Rajah 4.1(b) bergerak kehadapan tiba-tiba, kontena

barangan akan bergerak ke belakang. Terangkan mengapa. [1 markah]

__________________________________________________________________

__________________________________________________________________

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(e) Give one example of positive effect of inertia. [1 mark]

Nyatakan satu contoh kesan inertia yang positif. [1 markah]

__________________________________________________________________

5.(R,S,T)

Diagram 5.1(a) shows Ali kicking a football and Diagram 5.1(b) shows Ali kicking a rock.

Rajah 5.1(a) menunjukkan Ali sedang menendang bola dan Rajah 5.1(b) menunjukkan Ali

sedang menendang satu batu .

Diagram 5.1 /Rajah 5.1

(a) Define impulsive force. [1 mark]

Takrifkan daya impuls. [1 markah]

___________________________________________________________________

(b) The ball in diagram 5.1(a) has a mass of 1.5 kg. When Ali kicks the ball, it moves

from rest to 20 ms-1

in 0.2 s. Calculate the impulsive force that Ali exerted on the ball.

[2 marks]

Bola dalam Rajah 5.1(a) berjisim 1.5 kg. Apabila Ali menendang bola itu, ia

bergerak dengan halaju 20ms-1dari keadaan pegun dalam masa 0.2 s. Hitung daya

impuls yang dikenakan Ali ke atas bola itu. [2 markah]

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(c) The rock in Diagram 5.1(b) has the same mass with the ball (1.5 kg). When Ali

kicks the rock, it moves from rest to the same velocity as the ball (20 ms-1).

However, due to the rigidity of the rock, the time which Alis foot isin contact with

the rock is only 0.02 s. Calculate the impulsive force that Ali exerted on the rock.

[2 marks]

Batu dalam Rajah 5.1(b) mempunyai jisim yang sama dengan bola (1.5 kg). Apabila

Ali menendang batu itu, ia bergerak dengan halaju yang sama dengan bola (20ms-1)

dari keadaan pegun. Walau bagaimana pun, disebabkan kekerasan batu, masa kaki

Ali bersentuh dengan batu hanyalah 0.02 s. Hitung daya impuls yang dikenakan Ali

ke atas batu itu. [2 markah]

(d) Compare time of impact in Diagram 5.1(a) with Diagram 5.1(b). [1 mark]

Bandingkan masa perlanggaran dalam Rajah 5.1(a) dengan Rajah 5.1(b).

[1 markah]

__________________________________________________________________

__________________________________________________________________

(e) Compare the impulsive force in Diagram 5.1 (a) with Diagram 5.1(b). [1 mark]

Bandingkan daya impuls dalam Rajah 5.1(a) dengan Rajah 5.1(b). [1 markah]

__________________________________________________________________

__________________________________________________________________

(f) Compare the pain experience by Ali in Diagram 5.1(a) with Diagram 5.1(b).

[1 mark]

Bandingkan kesakitan yang dialami Ali dalam Rajah 5.1(a) dengan Rajah 5.1(b).

[1 markah]

____________________________________________________________________________________________________________________________________

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(g) Based on your answers in (d), (e) and (f), state the relationship between time of

impact, impulsive force and pain experienced by Ali. [1 mark]

Berdasarkan jawapan anda dalam (d), (e) dan (f), nyatakan hubungan antara masa

perlanggaran, daya impuls dan kesakitan yang dialami Ali. [1 markah]

__________________________________________________________________

__________________________________________________________________

(h) Suggest one way how Ali could reduce his pain in Diagram 5.1(b). [1 mark]

Cadangkan satu cara bagaimana Ali dapat mengurangkan kesakitannya dalam

Rajah 5.1(b). [1 markah]

___________________________________________________________________

6.(R,S,T)

Diagram 6.1 and Diagram 6.2 shows a student throwing an iron ball in a shot put event using

different throwing techniques.

The angle of projection and the force used by the student in both techniques are the same.

Rajah 6.1 dan Rajah 6.2 menunjukkan seorang murid melontar peluru dalam satu acara

sukan dengan teknik lontaran yang berbeza.

Sudut lontaran dan daya yang digunakan oleh murid itu dalam kedua-dua teknik adalah

sama.

Diagram 6.1 /Rajah 6.1

Diagram 6.2 /Rajah 6.2

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(a) Observe Diagram 6.1 and Diagram 6.2.

Perhatikan Rajah 6.1 dan Rajah 6.2.

(i) Compare the distance of the hand movement to throw the iron ball. [1 mark]

Bandingkan jarak pergerakan tangan untuk melontar peluru. [1 markah]

________________________________________________________________

________________________________________________________________

(ii) Based on answer in 6(a)(i), compare the work done by the student between the

two throwing techniques. [1 mark]

Berdasarkan jawapan di 6(a)(i), bandingkan kerja yang dilakukan oleh murid di

antara dua teknik lontaran itu. [1 markah]

________________________________________________________________

________________________________________________________________

(iii) If the force which acts on the iron ball is 20 N and the distance of hand

movement is 0.5 m, calculate the work done by the student. [2 marks]

Jika daya yang dikenakan ke atas peluru ialah 20 N dan jarak pergerakan

tangan ialah 0.5 m, hitung kerja yang dilakukan oleh murid itu. [2 markah]

(b) (i) Based on the answer in 6(a)(i), state the relationship between the energy gained

by the iron ball and the distance of projection. [1 mark]

Berdasarkan jawapan di 6(a)(i), nyatakan hubungan antara tenaga yang

diperoleh peluru dengan jarak lontaran. [1 markah]

________________________________________________________________

________________________________________________________________

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(ii) State the principle involved. [1 mark]

Namakan prinsip yang terlibat. [1 markah]

________________________________________________________________

(c) (i) Using Diagram 6.1, what happens to the falling time if an iron ball of a bigger

mass is used? [1 mark]

Menggunakan Rajah 6.1, apakah yang berlaku kepada masa jatuhan peluru jika

peluru yang berjisim lebih besar digunakan? [1 markah]

________________________________________________________________

________________________________________________________________

Beri satusebab bagi jawapan di 6(c)(i). [1 markah]

________________________________________________________________

________________________________________________________________

7.(R,S,T)

Diagram 7 shows a worker lifting a load of mass 20 kg using a pulley system. The worker

applies a force of 220 N to pull the rope down a distance of 0.5 m. The load is raised to a

height of 0.5 m.

Rajah 7 menunjukkan seorang pekerja mengangkat beban berjisim 20 kg dengan

menggunakan system takal. Pekerja itu menggunakan daya 220 N untuk menarik tali sejauh

0.5 m. Beban tersebut dinaikkan setinggi 0.5 m.

Diagram 7 /Rajah 7

(a) What is meant by work? [1 mark]

Apakah yang dimaksudkan dengan kerja? [1 markah]

__________________________________________________________________

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(b) Calculate the work done

Hitung kerja yang dilakukan

(i) by the worker to pull the rope down a distance of 0.5 m. [2 marks]

oleh pekerja tersebut untuk menarik tali sejauh 0.5 m. [2 markah]

(ii) on the load to raise it to height of 0.5 m. [2 marks]

ke atas beban untuk menaikkan beban itu setinggi 0.5 m. [2 markah]

(c) (i) Compare the work done in 7(b)(i) and 7(b)(ii). [1 mark]

Bandingkan kerja yang dilakukan di 7(b)(i) dan di 7(b)(ii). [1 markah]

_______________________________________________________________

_______________________________________________________________

(ii) State why there is a difference between the work done in 7(b)(i) and 7(b)(ii).

[1 mark]

Nyatakan mengapa terdapat perbezaan antara kerja yang dilakukan di 7(b)(i)

dan di 7(b)(ii). [1 markah]

________________________________________________________________

_______________________________________________________________

8.

(R,S,T)Diagram 8.1 shows two identical spherical plasticine balls before being released from the

same height. Diagram 8.2 shows the state of the plasticine balls when they hit the wood and

the sponge. It was observed that the plasticine stopped more quickly when it hit the wood.

Rajah 8.1 menunjukkan dua ketul bebola plastisin yang serupa sebelum dilepaskan dari

kayu dan span. Diperhatikan plastisin itu berhenti dengan lebih cepat apabila menghempap

permukaan kayu.

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Diagram 8.1 /Rajah 8.1

Diagram 8.2 /Rajah 8.2

(a) (i) What does the word momentummean? [1 mark]

Apakah yang dimaksudkan dengan momentum? [1 markah]

_______________________________________________________________

(ii) Observe Diagram 8.1 and Diagram 8.2, compare the shape of the plasticine balls,

the surface of the wood and the surface of the sponge before and when the

plasticine balls hit the surfaces.

Relate the changes in shapes of the plasticine balls and the surfaces to deduce a

relevant physics concept. [5 marks]

Perhatikan Rajah 8.1 dan Rajah 8.2, bandingkan bentuk bebola plastisin,

permukaan kayu dan permukaan span sebelum dan apabila bebola plastisin

menghempap kedua-dua permukaan itu.

Hubungkaitkan perubahan bentuk bebola plastisin dan kedua-dua permukaan itu

untuk membuat satu kesimpulan tentang konsep fizik yang berkaitan. [5 markah]

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

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(b) Explain the changes in energy that occur from the moment the plasticine ball is

released until it reaches the position in Diagram 8.2. [4 marks]

Terangkan perubahan tenaga yang berlaku semasa plastisin itu dilepaskan sehingga

mencapai kedudukan seperti pada Rajah 8.2. [4 markah]

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

__________________________________________________________________

9.

(R,S,T)

Diagram 9.1 (a) shows a boy skating down a ramp from position X.

Diagram 9.1 (b) shows the velocity-time graph of the boy from X to Z.

Rajah 9.1 (a) menunjukkan seorang budak lelaki meluncur turun landasan dari kedudukan X.

Rajah 9.1 (b) menunjukkan graf halaju-masa bagi budak lelaki itu dari X ke Z.

Diagram 9.1 (a) Diagram 9.1 (b)

Rajah 9.1 (a) Rajah 9.1 (b)

Diagram 9.2 (a) shows the same boy skating down from position Y by using another ramp.

Diagram 9.2 (b) shows the velocity-time graph of the boy from Y to Z.

Rajah 9.2 (a) menunjukkan budak lelaki yang sama meluncur turun dari kedudukan Y

menggunakan landasan yang lain.

Rajah 9.2 (b) menunjukkan graf halaju-masa bagi budak itu dari Y ke Z.

Diagram 9.2 (a) Diagram 9.2 (b)

Rajah 9.2 (a) Rajah 9.2 (b)

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Both ramps are of the same slope and surface.

Kedua-dua landasan mempunyai kecerunan dan permukaan yang sama.

(a) Name the physical quantity represented by the gradient of the velocity-time graph.

[1 mark]

Nama kuantiti fizik yang mewakili kecerunan graf halaju-masa itu. [1 markah]

___________________________________________________________________

(b) Observe Diagram 9.1 (a) and Diagram 9.2 (a).

Perhatikan Rajah 9.1 (a) dan Rajah 9.2 (a).

(i) Compare the gravitational potential energy of the boy at X and Y. [1 mark]

Bandingkan tenaga keupayaan graviti budak itu pada X dan Y. [1 markah]

________________________________________________________________

________________________________________________________________

(ii) Compare the velocity of the boy at Z in these two situations. [1 mark]

Bandingkan halaju budak itu pada Z dalam kedua-dua situasi ini. [1 markah]

________________________________________________________________

________________________________________________________________

(iii) Compare the kinetic energy of the boy at Z in these two situations. [1 mark]

Bandingkan tenaga kinetik budak itu pada Z dalam kedua-dua situasi ini.

[1 markah]

________________________________________________________________

________________________________________________________________

(c) Based on the answers in 9 (b),

Berdasarkan jawapan dalam 9 (b),

(i) state the relationship between the gravitational potential energy and the kinetic

energy of the boy. [1 mark]

nyatakan hubungan antara tenaga keupayaan graviti dengan tenaga kinetik bagi

budak itu. [1 markah]

________________________________________________________________

________________________________________________________________

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(ii) state the physics concept involved. [1 mark]

nyatakan konsep fizik yang terlibat. [1 markah]

________________________________________________________________

(d) (i) Based on Diagram 9.1 (a), what happens to the velocity of the boy when he

skates from Z to Q? [1 mark]

Berdasarkan Rajah 9.1 (a), apakah yang berlaku kepada halaju budak itu

apabila dia meluncur dari Z ke Q? [1 markah]

_________________________________________________________________

_________________________________________________________________

(ii) Give onereason for the answer in 9(d)(i). [1 mark]

Berikan satusebab kepada jawapan di 9(d)(i). [1 markah]

________________________________________________________________