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29 Oktober 2008
Aryati
Bahasa Inggris Kelas 9

Perbedaan kalimat tanya is it ,does it, is there,are you, do you, can you?

Please learn the sentences below.

1a. Is it your pen?

 b.  Is it running well?

 c.  Is there a teacher in your class?

 d.  Are you a new student?

( Is, Are (to be) biasanya diikuti Noun/ kata benda,  

  Adjective/kata sifat ,  adverb/kata keterangan 

  dan juga bisa diikuti Verb+ing untuk menyatakan

  bahwa kegitannya sedang berlangsung. (present

  continuous tense) 

 

2.  Does it work well?

    Do you like swimming?

   ( Do, Does bila digunakan dalam kalimat tanya akan selalu diikuti VERB1/ infinitive, yang menyatakan kegiatan rutin (present tense). Dan tidak akan diikuti Verb+ing

 


Operator

29 Oktober 2008
Matematika Kelas 9

topi ulang tahun tinggi 42 cm dan diameter alsnya 14 cm hitunglah: a)luas karton untk membuat topi itu ! b) volume udara di topi itu

Topi ulang tahun yang dimaksud mbak Sinta tentunya berbentu kerucut kan ? Kalau ya jawabnya sebagai berikut :

Tinggi kerucut : t = 42 cm

diameter alas ; d = 14 cm

                      r = 7 cm

Panjang garis pelukis ; s = √(422 + 72)

                                    = √(1764 + 49)

                                    = √1813

                                    = 42,6 cm

 Luas selimut kerucut :

 L = ∏rs

    = (22/7) x 7 x 42,6

   =937,2

Jadi luas karton untuk membuat topi tersebut 937,2 cm2

b. Volume udara :

    V = (1/3)∏r2t

       = (1/3) x(22/7) x72x42

       = 2156

Jadi volume udara di to[i tersebut 2156 cm3
 


Surahmanto, S.Pd

29 Oktober 2008
Rudi
Matematika Kelas 9

Rumus mencari nilai diskriminan itu apa yah??

Mungkin yang dimaksud  :

Jika ax2 + bx + c = 0 , maka nilai diskriminannya

 D = b2 - 4ac


Murni Kusumawati, S.Pd

28 Oktober 2008
dika
Bahasa Inggris Kelas 11

kak tolong dunk kasih contoh narrative text yang temanya teknologi..plisss

Dear Dika,

Biasanya jenis teks yang berhubungan dengan teknologi adalah jenis analytical exposition, hortatory exposition, explanation, discussion atau report serta procedure 


Operator

28 Oktober 2008
dika
Bahasa Inggris Kelas 11

kak tolong kasih contoh narrative text yang da hubungannya ma teknologi..!!!!thanks

Dear Dika,

Biasanya jenis teks yang berhubungan dengan teknologi adalah jenis analytical exposition, hortatory exposition, explanation, discussion atau report serta procedure


Operator

28 Oktober 2008
sany
Bahasa Inggris Kelas 9

k\' .. batu zodiak contoh report nya gmna c? ga ngrti..

Bila teks report yang anda maksud seperti dalam pembelajaran Bahasa Inggris SMP (tujuan dari konsultasi web ini), adalah teks yang mendeskripsikan tentang sesuatu/peristiwa yang bersifat umum/general.

Sehingga untuk tema batu zodiak, maka teks report harus menjelaskannya secara umum.

Contoh:

Birthstones, Zodiac and Anniversary Stones

Birthstones are of special interest to gemstone lovers and the association of specific gemstones with months of the year goes back centuries. As the famous gemologist G.F. Kunz noted in his book, The Curious Lore of Precious Stones, "There is no doubt that the owner of a ring or ornament set with a birthstone is impressed with the idea of possessing something more intimately associated with his or her personality than any other stone, however beautiful or costly. The idea that birthstones possess a certain indefinable, but nonetheless real significance has long been present and still holds a spell over the minds of all who are gifted with a touch of imagination and romance."

Precious gems were first associated with signs of the zodiac. The modern birthstone list was formulated by an organization known as The Jewelers of America in 1912.

 


Operator

28 Oktober 2008
ricardo
Bahasa Inggris Kelas 12

sy mw tax karangan bahasa inggris judulnya liburan sebanyak 300 kata.

Thursday, October 16, 2008

Vacation to London; the clear example of recount text

Mr. Richard’s family was on vacation. They are Mr. and Mrs. Richard with two sons. They went to London. They saw their travel agent and booked their tickets. They went to the British Embassy to get visas to enter Britain. They had booked fourteen days tour. This includes travel and accommodation. They also included tours around London
They boarded a large Boeing flight. The flight was nearly fourteen hours. On the plane the cabin crews were very friendly. They gave them news paper and magazine to read. They gave them food and drink. There was a film for their entertainment. They had a very pleasant flight. They slept part of the way.
On arrival at Heathrow Airport, they had to go to Customs and Immigration. The officers were pleasant. They checked the document carefully but their manners were very polite. Mr. Richard and his family collected their bags and went to London Welcome Desk. They arranged the transfer to a hotel.
The hotel was a well-known four-star hotel. The room had perfect view of the park. The room had its own bathroom and toilet. Instead of keys for the room, they inserted a key-card to open the door. On the third floor, there was a restaurant serving Asian and European food. They had variety of food.
The two week in London went by fast. At the end of the 14-day, they were quite tired but they felt very happy.
 

Wednesday, March 26, 2008

Visiting Bali; a recount text

There were so many places to see in Bali that my friend decided to join the tours to see as much as possible. My friend stayed in Kuta on arrival. He spent the first three days swimming and surfing on Kuta beach. He visited some tour agents and selected two tours. The first one was to Singaraja, the second was to Ubud.
On the day of the tour, he was ready. My friend and his group drove on through mountains. Singaraja is a city of about 90 thousands people. It is a busy but quiet town. The street are lined with trees and there are many old Dutch houses. Then they returned very late in the evening to Kuta.
The second tour to Ubud was a very different tour. It was not to see the scenery but to see the art and the craft of the island. The first stop was at Batubulan, a center of stone sculpture. There my friend watched young boys were carving away at big blocks of stone. The next stop was Celuk, a center for silversmiths and goldensmiths. After that he stopped a little while for lunch at Sukawati and on to mass. Mass is a tourist center
My friend ten-day-stay ended very quickly beside his two tour, all his day was spent on the beach. He went sailing or surfboarding every day. He was quiet satisfied.

 

Operator

28 Oktober 2008
CHARY
Bahasa Inggris Kelas 9

TOLONG BERI PENJELASAN DAN CONTOH DARI : REPORT TEXT, DESCRIPTIVE TEXT,NARRATIVE TEXT,RECOUNT TEXT.

RECOUNT

Recount Tujuan komunikatif: Melaporkan peristiwa, kejadian atau kegiatan dengan tujuan memberitakan atau menghibur. Struktur teks: * Pendahuluan (orientasi), yaitu memberikan informasi tentang apa, siapa, di mana dan kapan; *  Laporan (rentetan) peristiwa, kegiatan yang terjadi, yang biasanya disampaikan secara berurut

Contoh:

Class Picnic

Last Friday our school went to Centennial Park for a picnic

First our teachers marked the rolls and the we got on the buses. On the buses, everyone was chatting and eating. When we arrived at the park, some students played cricket, some played cards but others went for a walk with the teachers. At lunchtime, we sat together and had our picnic. Finally, at two o’clock we left for school.

We had a great day.

PROCEDURE

Procedure, the communicative purpose is to tell the steps of making or doing something. (Tujuan komunikatif nya: memberi petunjuk cara melakukan sesuatu melalui serangkaian tindakan atau langkah.) 

Generic Structure: Goal/Aim – Materials/Tools – Steps/Methods

Language Features of Procedure text:

-         Imperative form, ex: Cut, Pour,  Don’t mix, dsb.

-         action verbs: turn, put, don’t, mix, dsb.

-         connectives (untuk mengurutkan kegiatan), ex: then, while, dsb.

-         adverbials (untuk menyatakan rinci waktu, tempat, cara yang akurat), ex: for five minutes, two centimetres from the top, dsb.

Contoh:

SESAME DROP BISCUITS

 

    Materials:

a.      2 cups flour

b.      1 ½ teaspoons baking powder

c.       ½ reaspoon each baking soda and salt

d.      Butter  or margarine

e.       2 tablespoons sesame seed

f.        1 cup buttermilk

 

Night Before:

g.      In a large bowl stir together flour, baking powder, soda and salt.

h.      With 2 knives or pastry blender cut in ½ cup butter until particles are fine .

i.        Stir in sesame seed.

 

Next Morning:

j.        Add buttermilk to flour mixture and stir with a fork just until mixed.

k.      Drop by tablespoons on greased cookies sheet.

l.        Bake in preheated 450 degrees oven until light brown. 12 to 14 minutes.

m.     Serve at once with butter.

 

REPORT 

Report Tujuan Komunikatif: Menyampaikan informasi tentang sesuatu, apa adanya, sebagai hasil pengamatan sistematis atau analisis. Yang dideskripsikan dapat meliputi gajala alam, lingkungan, benda buatan manusia, atau gejala- gejala sosial. Deskripsi sebuah teks report dapat berupa simpulan umum misalnya tentang rumah sederhana dengan mendekripsikan ciri-ciri subyek tersebut sehingga layak dikategorikan rumah sederhana, dsb.

Contoh:

Fax Machine

Fax, the short term for facsimile is a telecommunications technology used to transfer copies (facsimiles) of documents, especially using affordable devices operating over the telephone network. The word telefax, short for telefacsimile, for "make a copy at a distance", is also used as a synonym. The device is also known as a telecopier in certain industries. When sending documents to people at large distances, faxes have a distinct advantage over postal mail in that the delivery is nearly instantenous, yet its disadvantages in quality and its proprietary format have relegated it to a position beneath email as the prevailing form of electronic document tranferral.

NARRATIVE

Narrative Tujuan Komunikatif Teks: Menghibur pendengar atau pembaca dengan pengalaman nyata atau khayal. Ciri naratif adalah adanya unsur konflik (masalah) dan resolusi (penyelesaian masalah). Jumlah masalah atau penyelesaiannya mungkin hanya satu, mungkin juga lebih.   Struktur Teks: * Pengenalan latar: tokoh, waktu, dan tempat: * Pengembangan konflik; * Penyelesaian konflik; *  Koda: perubahan yang terjadi pada tokoh atau pelajaran yang dapat dipetik dari cerita.

Contoh:

It was a warm day in March. I was very excited. The day had finally come. I was in the rowing team for the Olympics. I got up very early and exercised as always. Then after breakfast I drove to Drummoyne. My team arrived and at last it was time to start.

Ready, set and the starting gun went off. We began in the third position and were slowly moving closer. There they were. We could see the second boat and then we did it.

We moved past. My arms were aching. My whole body was sore but we all rowed harder.

The first boat was just in front  I saw a dark shadow near the boat. I looked again. What was it? I was sure  it was the shape of a cigar. ‘Oh my  God’,  I thought, ‘I must be seeing things. A shark in Parramata River? Impossible!’

Just then I pulled my oar out of the water. ‘Oh no, why only half?’ I thought. Then I knew. I shouted to my team, ‘Shark! Shark!’ and suddenly we forgot the race. We rowed faster than ever back to shore. We made it. Phew, we were safe!

DESCRIPTIVE

Tujuan Komunikatif :   Struktur Teks:nciri-ciri seseorang, suatu benda atau tempat tertentu.   * Pengenalan benda, orang atau sesuatu yang akan dideskripsikan. * Deskripsi: menggambarkan ciri-ciri benda tersebut,misalnya berasal dari mana, warnanya, ukurannya, kesukaannya dsb. Deskripsi ini hanya memberikan informasi mengenai benda atau orang tertentu yang sedang dibahas saja, misalnya deskripsi tentang ‘My Dog’. Ciri-ciri ‘anjing saya’ tersebut dapat berbeda dengan anjing yang lain.

Contoh:

The Ambarawa Train Museum houses 21 antique locomotives plus two more, which are stored in the depot. These locomotives are no longer produced; even the factories that made them no longer exist. The main building of this museum is the defunct Ambarawa railway station which was built in 1873. the station covers 127,500 m2.

The oldest in this museum is a locomotive made by Hartman Chemnitz. This locomotive, with a length of 8.58 m and a width of 2.45 m, began its operation in 1891. Using wood as fuel, the steam locomotive could run 50 km/h – its maximum speed.

A special part of a visit to this museum is a trip by train from the Ambarawa Train Museum to the defunct Bedono train station. This package tour is called Railway Mountain Tour. Why is the trip so special? Because the participants will board an antique train and the train will travel on a 4.9 kilometer-cog railway, which is the only one in the world.

 

NARRATIVE

Tujuan Komunikatif Teks: Menghibur pendengar atau pembaca dengan pengalaman nyata atau khayal. Ciri naratif adalah adanya unsur konflik (masalah) dan resolusi (penyelesaian masalah). Jumlah masalah atau penyelesaiannya mungkin hanya satu, mungkin juga lebih.   Struktur Teks: * Pengenalan latar: tokoh, waktu, dan tempat: * Pengembangan konflik; * Penyelesaian konflik; *  Koda: perubahan yang terjadi pada tokoh atau pelajaran yang dapat dipetik dari cerita.

Contoh:

Long ago on the top of Mount Kinabalu in Borneo, there lived a dragon. He owned a large and beautiful pearl. People believed that he controlled the weather with it.

            The emperor of China heard this and wanted the pearl. He sent his two sons, Wee Ping and Wee San to Borneo to steal it. The princes, together with one hundred soldiers, set sail for Borneo in twelve sailing junks.

            When they arrived in Borneo, The set out immediately to find the famous mountain. Their journey up the rugged slopes of Mount Kinabalu proved very difficult. The dragon guarded his cave very fiercely and killed many of their soldiers.

            Then Wee San had a clever idea. He climbed a tall tree, so he could see the dragon’s cave. He noted what time the dragon left his cave to hunt for food and what time he returned  to it.

            Next he ordered his men to make a fake pearl and a large kite. He waited until the dragon left his cave. Then he placed the fake pearl in a bag, slung it across his shoulder and flew up to the mountain-top on the kite. He exchanged the real pearl for the fake one and then his brother pulled his kite back to the ground.

            The brothers quickly returned to their ships and set sail for China. They sailed safely home. The emperor was thrilled with the pearl and gave a big party to celebrate his sons’ return.

 


Operator

28 Oktober 2008
Kirara..SMA grobogan1
Bahasa Inggris Kelas 12

ehmmm sa g aku di kasih contoh resume 12 genre text..kalo kepanjangan kasih link dimana aku bisa download na... ditunggu...n moga ja sa cepet...

Genres / Text Types

\"\"
Ini adalah ringkasan dari beberapa jenis teks / genres yang paling dominan dalam konteks Budaya Bahasa Inggris yang diajarkan dari SMP Kelas 7 sampai SMA Kelas 12. Materi ini diadaptasi dari Making Sense of Functional Grammar (Gerot and Wignell, 1994) serta Presentasi oleh Helena I.R. Agustien Phd

Genres

Social Function (Tujuan / Fungsi Sosial)

Generic Structure (Struktur)

Significant Lexicogrammatical Features (Ciri – ciri yang menonjol)

Narrative

To amuse, entertain, and to deal with actual or vicarious experiences in different ways. (Untuk menghibur pembaca melalui cerita).

a. Orientation: Sets the scene and introduces the participants. (Memperkenalkan tokoh dan setting).b. Complication : A crisis arises (Munculnya masalah).c. Resolution : the crisis is resolved (Terselesainya masalah).e. Evaluation : A stepping back to evaluate the plight. (Melangkah ke belakang untuk memikirkan nilai / makna sebuah peristiwa, bisa ada dan tidak)d. Reorientation : Optional (Bisa ada / atau tidak ada fungsinya menyimpulkan isi cerita ) a. Focus on specific usually individualized participants. (Fokus pada tokoh – tokoh tertentu secara individu).b. The use of Simple Past (Penggunaan Tenses Masa Lampau)c. The use of temporal conjunction (Penggunaan kata penghubung yang menunjukkan waktu ex : After, before, when dll).d. The use of noun phrases (Penggunaan frasa kata benda yang kaya dengan adjective misalnya : long black hair, two red apples.

Descriptive

To describe a particular person, place or thing (Untuk menggambarkan orang, benda, atau tempat tertentu secara khusus)

a. Identification : Identifies phenomenon ( Mengidentifikasi / pengenalan fenomena / hal yang dideskripsikan).b. Description : Menggambarkan bagian, kualitas, maupun ciri – ciri) a. The Use of Simple Present Tense (Penggunaan Simple Present Tense). b. Focus on Specific Participant (Fokus kepada Hal / orang / tempat secara khusus)

Recount

To tell events for the purpose of informing or entertaining (Melaporkan peristiwa, kejadian atau kegiatandengan tujuan memberitakan atau menghibur) a. Orientation : Provides the setting and introduces the participants (yaitu memberikan informasi tentang apa, siapa, di mana dan kapan). b. Events : Tell what happened in what sequence ( Laporan urutan kegiatan yang biasanya disampaikan secara berurutan)c. Reorientation : Optional – closure of events. (biasanya berisi komentar pribadi / penilaian jika ada a. Use of past tense : Penggunaan waktu masa lampau) b. Focus on temporal sequence (Fokus pada urutan waktu dengan kata – kata penghubung yang menunjukkan waktu mis : when, after, then dsb). c. Noun dan noun phrases.

Genres

Social Function (Tujuan / Fungsi Sosial)

Generic Structure (Struktur)

Significant Lexicogrammatical Features (Ciri – ciri yang menonjol)

Report

To describe the way things are with reference to a range of natural, man – made and social phenomenon in our environment. (Menyampaikan informasi tentang sesuatu, apa adanya, sebagai hasil pengamatan. Yang dideskripsikan dapat meliputi gajala alam, lingkungan, benda buatan manusia, atau gejala-gejala sosial) a. General Classification: tells what the phenomenon under discussion is ( Pernyataan secara umum yang menjelaskan tentang objek yang dideskripsikan. Keterangan, dan klasifikasinya). b. Description : tells what phenomenon under discussion is like in terms of parts, qualities, habits, or behaviors (if living) or uses (if non-natural) (Memberikan penjelasan tentang hal yang dideskripsikan. kalau hal yang dideskripsikan merupakan benda hidup maka bisa dideskripsikan bgian – bagiannya, kualitasnya, kebiasaanya, atau perilakunya. Kalau benda mati maka yang dideskripsikan adalah kegunannya) a. Focus on generic participants : Fokus pada hal secara umum. b. Use of Present Tense (Unless extinct) (Pengunaan Present Tense kecuali kalau benda itu sudah punah.

Procedure

To describe how something is accomplished through a sequence of actions or steps (Menjelaskan bagaimana mencapai sebuah tujuan dengan memberikan serangkaian langkah / tindakkan) a. Goals (Tujuan yang hendak dicapai, biasanya ada dalam judulnya)b. Materials (Bahan – bahan, tidak semua jenis teks Prosedur ada). c. Steps A series of steps oriented to achieve the goal (Sejumlah langkah untuk mencapai tujuan. a. Use of simple present Tense often imperative (Penggunaan Simple Present Tense, sering kali merupakan kalimat perintah). b. Use mainly of temporal conjunction / connectives (penggunaan kata untuk mnerangkan waktu misalnya then, after that) c. Penggunaan action verbs (Cut, Mix.

Analytical Exposition

To persuade the reader or listener that something is the case. (Untuk meyakinkan dan mempengaruhi pembaca atau pendengar bahwa ada masalah yang perlu mendapat perhatian) a. Thesis Position: Introduces topics and indicates writer’s position. (Memberitahukan topic dan menunjukkan pendapat penulis). b. Arguments Points : Menjelaskan argument dan elaborasi (dijelaskan secara mendetailc. Reiteration : Restates writer position : Menjelaskan kembali posisi penulis atau penguatan kembali posisi penulis General nouns, misalnya car, pollution, leaded petrol car, dsb.· Abstract nouns, misalnya policy, government, dsb.· Technical verbs, misalnya species of animals, dsb.· Relating verbs, misalnya It is important, dsb.· Action verbs, misalnya She must save, dsb.· Thinking verbs, misalnya Many people believe, dsb· Modal verbs, misalnya we must preserve, dsb.

· Modal adverbs, misalnya certainly, we, dsb.

· Connectives, misalnya firstly, secondly,dsb.

· Bahasa evaluatif, misalnya important, valuable, trustworthy, dsb.

* Kalimat pasif

Hortatory Exposition

To persuade the reader that something should or should not be the case. (Meyakinkan kepada pembaca bahwa sesuatu seharusnya dilakukan atau tidak dilakukan) a. Thesis : announcement of issue concern (Menjelaskan tentang hal yang dibahas) b. Arguments : Reasons for concerns, leading to recommendation (Alasan yang digunakan yang menuju pada rekomendasi tentang apa yang seharusnya / tidak seharusnya dilakukan)c. Statement : statement of what ought or ought not to happen (Pernyataan tentang apa yang seharusnya atau tidak seharusnya terjadi / dilakukan) Terfokus ke pembicara / penulis yang mengangkat isu.· Abstract nouns, misalnya policy, government,dsb.· Technical verbs, misalnya species of animals, dsb.· Relating verbs, misalnya should be, doesn’t seem to be dsb.· Action verbs, misalnya We must act, dsb.· Thinking verbs, misalnya I believe, dsb· Modal verbs, misalnya we must preserve, dsb

· Modal adverbs, misalnya certainly, wem dsb.

· Connectives, misalnya firstly, secondly, dsb

· Simple present tense

· Kalimat pasif

· Bahasa evaluatif, misalnya important, valuable, trustworthy, dsb.

Review

To critique an art work, event for a public audience. It includes movies, TV shows, books, plays, operas, recordings, exhibitions, concerts, and ballets. (Melakukan kritik terhadap peristiwa atau karya seni untuk pembaca atau pendengar halayak ramai, misalnya film, pertunjukan, buku, dll.) a. Orientation: places the work in its general context often by comparing it with others of its kind (Menempatkan karya tersebut dalam konteks secara umum seringkali dengan membandingkan karya lain yang sejenis). b. Interpretive Recount: summarizes the plot or / and provides an account of how the reviewed rendition of the work came into being. (Memberikan ringkasan alur dan atau Menafsirkan karya itu, struktur ini biasa ada atau tidak ada dalam suatu review). c. Evaluation : Provides an evaluation of the work and / or its performance or production (Memberikan evaluasi tentang karya atau pementasannya).
  • Terfokus pada partisipan tertentu;
  • Menggunakan:
  • adjectives menunjukkan sikap, seperti bad, good;
  • klausa panjang dan kompleks;
  • metafor.

Discussion

To present (at least) two points of view about an issue (Membahas suatu maslah yang paling tidak dipandang dari dua sudut pandang) a. Issue : Statement (Pernyataan tentang hal yang dibahas) b. Arguments for and against or statemetn of differingv points of view (Argumen yang mendukung atau melawan pernyataan). c. Point d. Elaboration (Penjelasan) e. Conclusion or Recommendation (Ringkasan atau rekomendasi) a. general nouns untuk menyatakan kategori, misalnya uniforms, alcohol, dsb,b. relating verbs untuk memberi informasi tentang isu yang didiskusikan, misalnya smoking is harmful, dsb.c. thinking verbs untuk mengungkapkan pandangan pribadi penulis, misalnya feel, believe, hope, dsb.d. additives, contrastives dan causal connectives untuk menghubungkan argumen, misalnya similarly, on the hand, however, dsb.e. detailed noun groups untuk memberikan informasi secara padu, misalnya the dumping of unwanted kittens, dsb.f. modalities, seperti perhaps, must, should, should have been, could be, dsb.g. adverbials of maner, misalnya deliberately.

News Item

To inform readers, listeners, or viewers about events of the day which are considered newsworthy or important (memberitahukan kepada pembaca, pendengar, atau penonton tentang sebuah peristiwa atau kejadian yang penting). a. Newsworthy events: Penceritaan kembali tentang Ringkasan kejadian. b. Background Events : Menjelaskan apa yang terjadi, kepada siapa dan dalam kondisi seperti apa. c. Source : komentar – komentar oleh para saksi, pelaku, pejabat setempat, atau ahli dalam kejadian tersebut. a. Terfokus pada orang, binatang, benda tertentu;b. Menggunakan action verbs, misalnya eat, run;c. Menggunakan keterangan waktu dan tempat;d. Menggunakan past tense;e. Disusun sesuai dengan urutan kejadian

Explanation

Menerangkan proses yang berlangsung dalam pembentukkan atau pelaksanaan kegiatan yang berhubungan dengan gejala – gelaja / fenomena sosio budaya. a. A general statement : Pernyataan umum b. A sequenced explanation : Penjelasan secara brerurutan mengapa atau bagaimana sesuatu terjadi. a. general dan abstract nouns, misalnya word chopping, earthquakes;b. action verbs;c. simple present tense;d. passive voice;e. conjunctions of time dan cause;f. noun phrase, misalnya the large cloud;g. abstract nouns, misalnya the temperature;

h. adverbial phrases;

complex sentences;

bahasa teknis;


Operator

27 Oktober 2008
Anang S
IPA Kelas 10

Apakah perbedaan antara koefisien gesekan statis dan koefisien gesekan kinetis ? Dalam perhitungan kinematika Fisika, kapan kita hrs menggunakan koef gesekan statis dan koef gesekan kinetis ? Kadang2x didlm soal selalu diketahui koef gesekan statis dan koef gesekan kinetis, yg mana hrs digunakan dlm perhitungan. Mohon penjelasan.

Koefisien gesekan kinetis adalah koefisien gesekan di mana benda yang bergesekan dalam keadaan bergerak, sedangkan koefisien gesekan statis dimiliki oleh benda yang diam. Jika dalam persoalan diketahui dua macam koefisien gesekan tersebut, maka, harus diketahui terlebih dahulu benda tersebut bergerak atau tidak.

 Contoh : gambar lihat di file terlampir

Jika m1 = 3 kg  dan m2 = 2 kg. m1 di atas meja mendatar dengan koefisien gesekan statis 0,3 dan koefisien gesekan kinetis 0,2.dihubungkan dengan tali melalui katrol yang terhubung dengan m2 menggantung di sisi meja. Berapa percepatan benda?

 

Dalam kasus ini yang digunakan adalah koefisien gesekan kinetis, karena benda bergerak.

 Untuk mengetahui benda bergerak atau tidak?

 Jika benda diam maka ΣF = 0

w2 - fs = 0

w2 = fs

m2 g = μs. N1

m2 g =  μs. m1 g

2 . 10 = 0,3 . 3 . 10

20 N ≠ 9 N

gaya tarik  w2 > fs sehingga benda bergerak. berarti yang dipakai adalah μk.

 

ΣF = m a

w2 - fk = (m1+m2) a 

20 - μk m1 g = (5) a

20 - 0,2 .3 .10 = 5 a

20 -  6 = 5 a

a = 14/5

 = 2,8 m/s2

 

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HERMAN MURSITO

 

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