Hong Kong Examinations and Assessment Authority & Curriculum Development Institute, EDB Teachers Meeting for HKDSE Physics SBA

Transcription

1 Hong Kong Examinations and Assessment Authority & Curriculum Development Institute, EDB Teachers Meeting for HKDSE Physics SBA Date : Time : Venue : 15 th November, 2014 (Saturday) 9:30 a.m. to 11:30 a.m. Lung Kong WFSL Lau Wong Fat Secondary School Programme : Time Events 9:30 a.m. 9:40 a.m. Registration 9:40 a.m. 9:55 a.m. Introduction SBA moderation SBA requirements Mr SZETO Yuk Tong (HKEAA) 9:55 a.m. 10:50 a.m. Supervisors remarks SBA Supervisors Report - Detailed report requirements (further clarification) Dr NG Pun Hon (CUHK) & Dr LAU Yiu Hon (EDB) 10:50 a.m. 11:15 a.m. Teacher s sharing - Using Motion Analysis apps of Android phones Mr LAW Man Wai (PLK Lo Kit Sing (1983) College) 11:15 a.m. 11:30 a.m. Q&A List of Documents 1. HKDSE SBA arrangement, Resource Materials and Useful Websites 2. PowerPoint presentations 3. Detailed reports Samples for discussion 4. Experiment Acceleration along an inclined plane (using Motion Analysis apps) (Mr Law Man Wai) 5. List of suggested experimental work for SBA 6. Most favourable distractors ( HKDSE Physics multiple-choice questions) ******************************************************************************************************* List of District Coordinators Gp. No. District Co-ordinators Gp. No. District Co-ordinators 1. Mr. MUI Yuen Hung ( 梅元鴻 ) 13. Dr. LAU Yiu Hon ( 劉耀漢 ) 2. Mr. CHU Wing Yin ( 朱永賢 ) 14. Mr. HONG Chung Yin ( 康仲賢 ) 3. Mr. CHIK Kin Hang ( 戚堅鏗 ) 15. Mr. HO Yau Sing ( 何有勝 ) 4. Mr. SHUM On-Bong ( 岑安邦 ) 16. Mr. TAM Kwok Wai ( 譚國偉 ) 5. Ms. LIN Chi Wan ( 林紫雲 ) 17. Mr. WAN Ka Kit ( 温家傑 ) 6. Dr. NG Pun Hon ( 吳本韓 ) 18. Mr. LUK Wai Hi ( 陸偉禧 ) (New) 7. Mr. LEUNG Ngai Chung ( 梁毅聰 ) 19. Mr. LO Wai Pui ( 羅偉培 ) 8. Mr. MAK Tsz Pun ( 麥子彬 ) 20. Mr. LEE Chi Ming ( 李志明 ) 9. Mr. CHUNG Sai Chak ( 鍾世澤 ) 21. Mr. YUE Kwok Wah ( 余國華 ) 10. Mr. LAW Man Wai ( 羅文惠 ) 22. Mr. LEE Wai Kit ( 李維傑 ) 11. Mr. LAW Chak Sang ( 羅澤生 ) 23. Mr. MA Chin Kay ( 馬展基 ) 12. Mr. PANG King Fai ( 彭景暉 ) 24. Mr. YING Pui Chi, Bosco ( 英佩詞 ) indicates change of District Co-ordinator Co-Supervisors: Dr. LAU Yiu Hon ( 劉耀漢 ) and Dr. NG Pun Hon ( 吳本韓 ) ******************************************************************************************************* File : D/Phy/TAS/2016/S6 SBA Mtg

2 Materials available on HKEAA web page ( 1. Handbook for School Leaders on SBA 2. SBA Teachers Handbook 3. SBA Sample Tasks ***************************************************************************************** 物理科教學資源 1. 課程資源 香港中學文憑物理科及組合科學科 ( 物理部分 ) 考試簡報會 教學要點說明 - 新高中組合科學課程 ( 物理部分 ) ( 報考 2016 香港中學文憑考試學生適用 ) 教學要點說明 - 新高中物理課程 ( 報考 2016 香港中學文憑考試學生適用 ) 教學要點說明 - 新高中組合科學課程 ( 物理部分 ) ( 報考 2015 香港中學文憑考試學生適用 ) 教學要點說明 - 新高中物理課程 ( 報考 2015 香港中學文憑考試學生適用 ) 香港中學文憑考試物理及組合科學 ( 物理 ) 校本評核樣本作業 ( 實驗有關作業 ) 香港中學文憑考試物理科 - 校本評核樣本作業 ( 探究研習 ) 香港中學文憑考試物理 / 組合科學 ( 物理 ) - 數據 公式和關係式 香港中學文憑考試校本評核建議物理實驗名單 2. 物理科教師專業發展及資源共享平台 3. 天文學和航天科學 4. 原子世界 5. 能量和能源的使用 6. 醫學物理學 Interactive Learning and Teaching Package for Medical Physics 7. 高解像度運動錄像分析 (HDMVA) Tracker - 教育電視資源 中文版 ) ( 英文版 ) 探究研習 ( 物理篇 ) 探究研習 是新高中物理課程其中一個的重要學與教活動 課程提供一定的課時, 在教師指導下 進行相對獨立有計劃的學習經歷 學生在教師指導和實驗室技術員支援下訂定探究題目, 自主設計實驗, 主動進行探究, 收集及分析數據作出結論 探究研習 是通過調整教學方法, 提供學生主動積極自主學習的機會, 培養學生獨立思考與解決問題的能力 探究研習 是提升學生自學能力和教師教學方法的一個平台 教師會因應學校 ( 校本 ) 和學生能力差異的情況, 設計探究的流程 模式 課題 難度等以推行探究活動 這教育電視節目以記錄片形式, 讓教師們及學者分享在學校推行 探究研習 的理念和策略, 也讓學生們說出進行探究時所經歷的學習過程和所獲得到的滿足感 實驗室技術員亦分享了在 探究研習 過程中為教師及學生所提供的支援 本節目極為適合教師 學生及實驗室技術員觀看欣賞, 並作為新高中物理科 探究研習 的輔助學習教材 ( 中文播出版 ) ( 英文播出版 ) ( 學生 - 中文版 ) ( 學生 - 英文版 )

3 通訊新領域 香港城市大學電子工程學系及毫米波國家重點實驗室陸貴文講座教授 陳志豪講座教授和薛泉教授經過 十年來的努力不懈, 研發無線通訊天線技術, 配合國家科技發展和應用, 獲得 2011 年度 國家科學技術 獎 中, 國家科學技術發明獎二等獎, 為香港科研人員爭光, 亦為國家作出重大貢獻 ( 中文版 ) ( 英文版 ) 透視妙法 (Seeing Through the Human Body Part I) 節目透過模擬病例介紹三種現代醫學使用的先進診斷技術, 包括 X 射綫電腦斷層造影技術 磁共振造影 技術和內窺鏡檢視技術 節目對每一種醫療檢視方法都作一個概括的介紹, 同時利用三維動畫影像扼要 解釋背後所應用的物理學原理, 讓同學們除了認識各種掃描儀器的運作情況外, 更加加深對課堂上學習 的物理原理的理解, 引發學習的興趣和動機 本節目極為適合教師及學生作為新高中物理科 醫學物理 學 的學習教材 ( 中文版 ) ( 英文版 ) 透視妙法 (Sequel of Seeing Through the Human Body Part II) 節目透過模擬病例介紹現代醫學使用的先進診斷技術, 包括超聲波掃描技術和核子醫學檢視技術, 極為 適合教師及學生作為新高中物理科 醫學物理學 的學習教材 ( 中文版 ) ( 英文版 ) 天與地 (Sky and Earth) 本節目極為適合教師及學生作為新高中物理科 天文學和航天科學 的學習教材 節目介紹從地球看天 空時, 透過天球模型描述天體在空中的位置, 及在不同地理緯度所觀察到的天極和天赤道的位置, 包括 天球的週日運動和太陽的週年運動 ETV Channel ( 英文版 ) ( 中文版 ) Edcity ( 英文版 ) ( 中文版 ) 香港建築 : 中學教材之建築學導引 這教材是由香港建築師學會統籌, 香港大學建築學院社會項目工作坊研究支援, 香港特別行政區教育局提供顧問意見, 商務及經濟發展局轄下創意香港贊助 教材內容適合 能量和能源的使用 單元中有關熱傳送系數 總熱傳送值和建築節能措施的學與教用途 內容包括 : 建築力學 - 歷史回顧 建築的噪音控制與 綜合熱傳值和熱傳系數的計算和應用 模型製作工作坊 - 塔 視像 : 建築節能措施 / 演講廳的聲樂設計 / 城市熱島效應 實地考察 : 中環 - 摩天大廈的結構 / 香港濕地公園 - 人類影響 污染控制 可持續發展和能源效益 8. 香港中學文憑考試 ( 校本評核 / 評核大綱 ) 新聞稿 : 香港中學文憑考試校本評核精簡安排 (14/2/2012) 香港中學文憑科目評核大綱 ( 至 2016)

4 15 Nov

5 HKDSE SBA results (2014) Paper Mean SD Physics 72.5% 13.2% (2013 : 72.6%) (2013 : 12.9%) CS (Phy) 66.5% 12.6% (2013 : 68.7%) (2013 : 11.5%) 2

6 HKDSE SBA moderation Statistical Moderation supplemented by Professional Judgment (DC comments: Lenient/Appropriate/Strict) Over 90% adopt statistical adjustment, outstanding cases followed-up by Supervisors. 3

7 HKDSE SBA moderation Paper Candidature No. of Schools Physics CS (Phy) (2013 : ) (2013 : 440) (2013 : 2 946) (2013 : 170) Moderation Physics CS (Phy) lenient 12% or more 5.7% 4.6% (6 11)% 15.7% 23.8% 6% or less 61.3% 50.8% + (6 11)% 13.6% 15.4% strict + 12% or more 3.7% 5.4% 4

8 SBA work plan for Submission requirements in (Ref: School circular in late Sept) Month/Year 15 Nov 2014 SBA annual conference Sep 2014 Jun 2015 Events S6 and S5 SBA activities to be conducted by schools 7 Jan 28 Jan 2015 Online Submission of (1) SBA marks, (2) Student work samples, and (3) S5 and S6 Lists of experiments for 2015 Exam. (Use experiment list template provided at HKEAA website: SBA 校本評核 Forms 下載表格 SBAMarkTemplates 校本評核記分表 Physics 物理 SBA-PHY-ExpList) Mar May 2015 May Jun 2015 Jul 2015 Sep Oct 2015 Moderation of S6 SBA marks by the HKEAA S5 Lists of experiments for 2016 Exam and Blank worksheets to District Coordinator Release of 2015 HKDSE results Provision of feedback on the outcome of the SBA moderation of 2015 HKDSE to schools 5

9 S5 + S6 (2015 Exam and after) SBA Requirements UNCHANGED! 6

10 Physics CS (Physics) S5 1 Expt (6%) 1 Expt (5%) S6 1 Expt (6%) 1 IS/Expt* (8%) 1 Expt (5%) Note: Over the two years of S5 and S6, at least two marks for experiment (EXPT) and one mark for investigative study (IS) or an experiment with a detailed report (EXPT*). - Expt: Max. 5 entries; IS/Expt: Only 1 entry - Each task: 20 Marks 7

11 File: SBA-PHY-ExpList To ensure a reasonable number of practical activities for students, a minimum number of 8 tasks for Physics and 4 tasks for CS (Physics) is stipulated throughout the course. (SBA Handbook para. 2.2) 8

12 Requirements for 2016 Exam (Same as 2014) Please refer to 2016 SBA Teachers Handbook. HKEAA will inform schools requesting teachers to to District Coordinators in May 2015 : List of Experiments Performed in S5 and Blank worksheets for assessment. 9

13 Marking Schemes for tracking breakdown of marks Teachers are encouraged to attach the marking scheme or criteria, if any, for experiments (esp. detailed reports) for DC s reference [E.g. Practical skills (30%), Data recording & treatment (50%) and Conclusion & Discussion (20%)] Plagiarism: Serious cases (P cases): Task with P zero mark & Down ONE Level Less serious cases: - Zero mark for the task or only award the part done by the student Group experiment or IS accepted BUT Individual Reports are required, say, for parts starting from data treatment 10

14 User Manual Available on HKEAA website by November 2014 ( Enquiry Hotlines (Ms Tansy CHUN 秦誕沙 ) Briefing Sessions 2 identical sessions in December Tickets will be sent to schools in Nov 2014 Hands-on Training Workshops Date: 8 & 27 Jan 2015 Online registration from 2 January 2015 ( 11

15 12

16 Errors and STEM in Physics Practical Works NG Pun Hon

17 Samples Submitted reports from 20 schools The most common experiments: Centripetal force Internal resistance of a battery Focal length of a convex lens Diffraction grating The most common Investigative study: Using MVA to study certain motions (10 %)

18 Contents Some observations and suggestions concerning errors in: 1. Internal resistance of a battery 2. Centripetal force Physical science practical works in STEM education

19 Errors Seldom mentioned in DSE Biology and Chemistry Students may feel strange when coming across errors Causes and prevention Creative writing?? Blame everything!! Give some realistic suggestions on what you can do to improve the experiment.

20 Internal resistance of a battery V = emf - Ir Possible sources of errors?

21 Some points are not lying on the straight line and the percentage errors of emf = ( )/3.0=3%, and the causes of errors are ////////.. The data produce a very fitted straight line with a negative slope and a positive y-intercept, in agreement with the equation (V = emf Ir). The measured emf is only 3% different from the nominal value and the causes may be /..

22 The trend Reasonable? 合理嗎? ~ straight line Larger? Smaller? The sign of the slope The sign of the intercept(s) Origin? The order of magnitude The percentage difference / error Whether abnormalities (if any) can be explained

23 Meters are not ideal Temperature increases resistances increase Measurement error (not objective enough)

24 Temperature increases Current increases Ammeter and voltmeter are affected by magnetic field The poor quality of equipment

25 Centripetal Force Smooth? 眼

26 Why are 20 revolutions better than 10? Less percentage error Errors at Start and Stop Generally, no error between Start and Stop In this experiment, the timing errors at Start and Stop are negligible compared with other errors.

27 Why are 20 revolutions better than 10? Reduce the errors May reduce the effect of (random) errors Mean : an estimate of T 0 Mean : may be a better estimate of T Time of 1 rev. If the experiment is done carefully 0 Mean : a better estimate of T Time of 1 rev.

28

29

30 Why is it more accurate? 1. Reduce the errors 2. Reduce the percentage error

31 Latest Science Education Development UK National Curriculum 2013 USA NGSS (Next Generation Science Standards) STEM Education (Science, Technology, Engineering and Mathematics Education)

32 Physical science practical works in STEM education Solve authentic tasks or problems Construction Design and make Competition Water rocket Spaghetti bridge ///////.etc.

33 Construct measuring instruments Parameters to be measured Time, length, mass, temperature, light intensity, wind speed /// etc. The instrument must have a property that varies with the parameters to be measured. Calibrated with some standard references.

34 Temperature & Thermometer Liquid-in-glass Length of liquid column Thermistor Resistance Calibration Lower fixed pint Upper fixed point

35 Spring balance Length of the spring Chinese balance Mass & Balance Position of the hanging mass Calibration 1 or 2 standard masses Invite partners phng@cuhk.edu.hk

36 zero Long chopstick

37 Visit to Astropark and iobservatory for Learning and Teaching of Astronomy in Physics (New) 2014/11/24 (Mon) 2014/11/27 (Thu) (3:45 11:15 pm) 1

38 Detailed Report A Discussion SBA Conference (2014) 2

39 Centripetal Force 3

40 Comments & Suggestions Give less instructions Draw diagram to distinguish and Derive related equation Identify dependent and independent variables Plot graph to draw conclusion Estimate errors 4

41 Vector diagram 5

42 Theory ଶ ௧ ଶ r By geometry From Assume ଶ then ଶ ଶ ଶ 6

43 Four variables:,, and 1. Fixed and Vary and measure and verify ଶ ଶ Plot x against M Mass /Kg 7

44 Four variables:,, and 2. Fixed and Vary and measure and verify Plot T against t (t) tension due to Mg /N 8

45 Refractive Index 9

46 Comments & Suggestions Give less instructions Draw ray diagram Derive related equation Identify dependent and independent variables Plot graph to draw conclusion Estimate errors 10

47 Theory ௦ఏ ௦ఈ ଵ ௦ ௫/ ௫ ௬/ ௬ 11

48 Error Estimation Refractive index Value obtained by critical angle method Plot against Incident angle 12

49 Graph Sin ( ) Plot sin( ) against sin( ) y = x Refractive index = Sin ( ) 13

50 Alternative Methods 14

51 Observe Critical Angle At certain angle, the line suddenly disappears from view 15

52 Focal Length 16

53 Comments & Suggestions Give less instructions Draw ray diagram Derive related equation Identify dependent and independent variables Plot graph to draw conclusion Estimate errors 17

54 Ray diagram 18

55 Graph 1/V (cm 1 ) /f Plot 1/V against 1/U y = x /f /U (cm 1 ) 19

56 Graph V/cm Plot V (image distance) against U (objective distance) f U/cm 20

57 Method of no Parallax 21

58 Parallax 22

59 No parallax 23

60 Internal Resistance 24

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77 Physics Project Motion Analysis apps of Android phone Motion Analysis apps of Android Phone Part I Accelerometer 1. Install Accelerometer Monitor in an Android phone. Search the key word Accelerometer Monitor in Google Play Usually this apps is at the top of the list. When it is successfully installed, the following icon can be found in the application screen. 2. Click the icon to start the apps. You should get the following screen showing the a-t graphs. There are four graphs: x, y, z and resultant. Click the check boxes to unselect the unnecessary ones. select the graphs shown 50 samples per second graphs only z is selected and shown (white graph) time 3. The phone will measure the acceleration repeatedly. You can save the data in a file. Click the setting button of you phone (usually at the bottom left of the phone). A screen will come out with three options: Settings, Start Saving and Activate Alarm. Click Start Saving to start and Stop Saving to Stop. P.1

78 Physics Project Motion Analysis apps of Android phone 4. Click Settings to change the settings. In most circumstances, the default setting is fine. The motion sensor counts the earth gravity as an apparent acceleration of ms downwards. A stationary phone will read roughly 9.8 ms in the vertical direction. The phone provides a function to eliminate this but it does not work accurately. Do not use Remove Earth Gravity as this option does not work properly for phone with no gyroscope. We can subtract the measured values by 9.8 (or more correctly, the initial value measured when the phone is stationary) later to correct for this. Click Sensor Speed to select the suitable sensor speed. Use Slowest for projects like motion of elevator or MTR. It provides a sampling rate of 5 samples per second. Use higher speed (e.g. Game) for experiment like measurement of g. To plot a good graph, around 100 samples are suitable. Too much samples make it difficult to handle. P.2

79 Physics Project Motion Analysis apps of Android phone 5. The data are saved in the folder accdata in your phone. Depending on your setting, the data may be saved in SD card or internal storage. You may need to install a suitable driver in your computer to read the phone through USB. Remark: in some Andriod phones, it is found that there is problem in reading this folder from computer. You may copy the files to other location (e.g. root directory) of your phone by Android File Commander, etc. 6. Open the folder and copy the files (in txt format) to your computer. 7. As the apps does not provide any software to edit the data, we need to use Excel to plot graphs. Open the file in Excel. Remember to select the suitable file type in Excel so that the filename appears in the list. The following part shows the operation using Excel P.3

80 Physics Project Motion Analysis apps of Android phone 8. When the dialog box appears, select space as separators of data. Select using delimiter. Click Next. Click Next. Select Space here. Click Finish 9. If the file is opened properly, the data will be shown in a table. Ignore this part. As Space is used as delimiter, this part does not match the table below. X Y Z t The first three columns are accelerations in x, y and z directions. The unit is ms -2. The fourth column is time interval t. The unit is millisecond (10-3 s). P.4

81 Physics Project Motion Analysis apps of Android phone 10. The meaning of x, y and z directions are indicated below. z y x 11 The time increment t is captured instead of the real time. The real time can be found by summing up t. 12. An Excel template (template.xls) is included to convert the data into the conventional s-t, v-t and a-t graphs. Cut and paste the column of t and a (one of X, Y or Z depending on how you point your phone) into the template and it will do the numerical integration to get the s-t, v-t and a-t tables. To eliminate the false reading of gravity, enter the initial reading of a when the phone is stationary. (Note: the table contains up to 100 rows of data. It is not needed to use all rows. If more rows are required, please drag the row down.) Enter the value of the measure direction when the phone is stationary. Copy and paste the column of X/Y/Z and t from the last file to here. a-t, v-t and x-t graphs data is then found. P.5

82 Physics Project Motion Analysis apps of Android phone Part II Smart Compass 1 Install Smart Compass in the Android phone. Search the key word Smart Compass in Google Play Usually this apps is at the top of the list. When it is successfully installed, the following icon can be found in the application screen. 2. Click the icon to start the apps. You should get the following screen showing the compass. When the phone is held at a vertical position, two angles, roll and pitch, are shown in the bottom corner of the phone. roll pitch 3. To measure the inclination of a plane, place the straight edge of the phone along the plane. Set the pitch to as close to 90 o as possible. The inclination is shown by P.6

83 Physics Project Motion Analysis apps of Android phone the roll. 4. Some phones do not have straight edge. For these phones you may use the camera of the phone to line up the plane with the cross hair in the screen. The roll is the inclination of the plane. The diagram below shows how the inclination of a table is measured by using the camera. 5. Click MENU to enter the setup page of the apps. Usually the default is fine. Make sure that camera is turned on so that roll and pitch are displayed. P.7

84 Numerical Integration of Andriod Accelerometer Data (1) Enter value of a when the phone is stationary into the yellow box. (2) Cut and paste the columns of X/Y/Z and Dt from your raw data to the green columns. (3) This spreadsheet assumes that the phone is released from rest so that v and s are 0 when time is 0. (4) There are 100 rows. If there are less than 100 records. Ignore the rows at the bottom. If there are more than 100 rows, drag the last row down to increase the number of row. correction of a X/Y/Z Dt time(s) a(m/s2) time(s) v(m/s) time(s) s(m) E E E E E

85 Free Falling velocity/ms^-1 velocity/ms^ time/s Estimation of g time/s y = x

86 NSS Physics SBA Experiment p.1/5 Name: CSNO: Group: Acceleration along an inclined plane Objective: To determine the effect of inclination angle on the acceleration down an inclined plane Apparatus: 2 smart phones Inclined plane Trolley Blu-tack Soft cloth Old text books Theory When a trolley moves down along an inclined plane, it accelerates under the action of friction and the component of its weight along the plane. As the component of its weight depends on the angle of inclination, the acceleration increases as increases. friction f weight component W sin In analysis of inclined plane, you may take the weight component as W sin and assume the friction is independent on for small angles ( < 10 o ). Procedures 1. Install the apps Accelerometer and Smart Compass in your mobile phones. Study the user manual before you come to the laboratory. You may try these apps at home. 2. Set up an inclined plane along the side bench of the laboratory. 3. Attach a mobile phone with blu-tack on top of the trolley. The y-direction (refer to the user manual) should be pointing to the forward direction of the phone. Make sure the phone is firmly fixed. If required, you may use adhesive tape to fix the phone. Do not use an expensive phone for this purpose as it may be risky to get the phone scratched. P.1

87 NSS Physics SBA Experiment p.2/5 y-direction 4. Raise one end of the runway with old text books. Set to the largest height with all available books. To avoid over-speed, the inclination should be limited to be lower than 10 o. Place a piece of soft cloth at the bottom end to absorb the impact of the trolley. 5. Measure the inclination of the plane with the apps Smart Compass in another phone. 6. Put the trolley with the first smart phone on top side of the plane. Run the apps Accelerometer and start saving. 7. Release the trolley while the smart phone is capturing data. As the trolley reaches the bottom side of the trolley, stop saving at once. 8. Now reduce the inclination by removing one or two books. Repeat steps (5) to (7) for at least five more angles. Notice that the trolley may accelerate very slowly as the angle P.2

88 NSS Physics SBA Experiment p.3/5 becomes close to the one for friction compensated plane. 9. Copy the data files from the smart phone to computer. Open the text file with Excel as according to the steps in user manual. Locate the part in the table corresponding to the acceleration in the y-direction before and after the trolley is released. The initial reading is not zero since there is a false reading due to gravity. Get the mean acceleration before and after the trolley is released along the y-direction. X Y Z t Before release After release Results and Data Analysis From the data captured by the Accelerometer and angle read from the Smart Compass, complete the following table. Plot a graph of a a o versus sin. P.3

89 NSS Physics SBA Experiment p.4/5 Inclination sin Reading of Average reading of Average acceleration before acceleration after acceleration a - a o the trolley is the trolley is /ms -2 released a o /ms -2 released a/ms -2 Acceleration/ms -2 sin. P.4

90 NSS Physics SBA Experiment p.5/5 Full Report Submit a report as the continuation of the worksheet. It is not required to repeat the parts found in the worksheet. Please include the following parts to your report. (1) Theory Derive a theoretical relationship between the acceleration of the trolley, friction and inclination of the plane. Clearly state the meaning of all unknowns involved in your work. (2) Data analysis From the theoretical relationship you found in (a), determine the expected shape of the acceleration inclination graph you plotted in above. Compare the actual graph and the expected graph. (3) Conclusion Draw a conclusion from your result in your data analysis. (4) Discussion Comment on the error, accuracy and any matters related to the experiment. P.5

91 Please visit the following site to download the related materials of Motion Analysis apps (Mr LAW Man Wai)

92 2 mv F r (Revised as of 28 October 2013) The table below illustrates the considerable scope which teachers have in choosing practical work for SBA. It is hoped that this can help teachers plan their teaching and assessment arrangement. However, teachers should feel free to devise their own innovative or/and project-based practical activities for assessment in particular areas of the syllabus as long as they are of appropriate standard and can meet the criteria for awarding marks. There is no list of prescribed or recommended practical work which must be used for assessment purposes since teaching interests and resources vary from school to school. Some suggested experimental work Measurement of the specific heat capacity of a liquid using a low voltage immersion heater and a foam cup. Measurement of the specific latent heat of fusion of ice using a low voltage immersion heater. Measurement of the specific latent heat of vaporization of water using a mains heater. Cooling curve of octadecan-1-ol. Investigation of the relationship between pressure, volume and temperature of a gas. Study the effects of the normal force, materials involved and surface area on the force of friction using a block. Investigation of the relationship between (a) acceleration and force when the mass is constant; and (b) acceleration and mass under a constant force. Syllabus Topic of HKDSE (I) (I) (I) (I) Suitable for assessment Measuring g by simple pendulum / spring-mass system / HDMVA method. (II) Finding the C.G. of lamina with irregular shapes (II) Finding an unknown mass by balancing a ruler on a knife-edge using standard weights Conservation of linear momentum in elastic/inelastic collision of trolleys (further investigation on loss of kinetic energy in inelastic collisions). Experimental test of by whirling a rubber bung. Ripple Tank Experiments. (III) Measuring critical angle and refractive index of a semi-circular plastic block. (III) Stationary wave pattern at different frequencies using a signal generator. Estimation of the wavelength of light using (a) double slit; and (b) plane diffraction grating. Measurement of focal length of convex lenses by different methods: (a) image formation of a distant object; (b) plane mirror method; and (c) lens formula. (I) (II) (II) (II) (II) (II) (III) (III) (III) Finding the wavelength / wave speed of sound wave by interference of sound waves using two loudspeakers and CRO. (III)

93 Some suggested experimental work Drop in terminal p.d. of power supplies delivering current and using different voltmeters to measure the terminal p.d. of a power supply with high internal resistance. Using a current balance to measure the magnetic fields (a) between two magnadur magnets; (b) close to the end of a current-carrying coil; and (c) inside a flat solenoid carrying current. Using a Hall probe or a search coil to investigate the magnetic fields (a) around a long straight wire; (b) at the centre of a coil; (c) inside and around a slinky solenoid; and (d) inside a solenoid, carrying current. (Revised as of 28 October 2013) Syllabus Topic of HKDSE (IV) (IV) (IV) Suitable for assessment Investigation of the factors affecting the induced e.m.f. in a coil. (IV) Study of transformer action : (a) the effect of the flux linkage; (b) the relationship between voltage ratio and turn ratio; (c) the dependence of the current in the primary coil on the loading; and (d) comparison between input and output power. (IV) (a) Measurement of the resistance of a conductor with a voltmeter and an ammeter (Ohm s law). (b) Change of the resistance of filament of a lamp with temperature. (c) Change of the resistance of a conductor with its length and crosssectional area. Measurement of the internal resistance of a battery. (IV) Measurement of the power output of a battery with time (IV) Study of the factors affecting the strength of an electromagnet. (IV) Use of the oscilloscope as a d.c. and an a.c. voltmeter, for waveform display - and time base for frequency measurement. Study the relationship between light intensity of a light bulb with distance by a light meter. (VIII) (IV)

94 Multiple-Choice Questions, HKDSE Most Favourable Distractor Paper 1A Paper 2 Paper 1A Paper 2 Paper 1A Paper 2 1. D (21%) 1.1 B (36%) 1. D (37%) 1.1 A (10%) 1. A (10%) 1.1 A (24%) 2. B (12%) 1.2 D (26%) 2. C (24%) 1.2 C (29%) 2. D (24%) 1.2 B (32%) 3. B (33%) 1.3 C (18%) 3. A (28%) 1.3 C (21%) 3. A (11%) 1.3 D (24%) 4. C (17%) 1.4 B (20%) 4. A (20%) 1.4 C (43%) 4. C (20%) 1.4 B (28%) 5. D (28%) 1.5 D (30%) 5. D (23%) 1.5 C (39%) 5. D (34%) 1.5 D (29%) 6. C (24%) 1.6 D (26%) 6. B (22%) 1.6 A (21%) 6. B (33%) 1.6 A (21%) 7. B (17%) 1.7 A (22%) 7. D (34%) 1.7 D (19%) 7. B (36%) 1.7 A (50%) 8. B (26%) 1.8 A (17%) 8. B (37%) 1.8 A (24%) 8. A (28%) 1.8 D (37%) 9. C (7%) 9. C (14%) 9. C (5%) 10. A (18%) 2.1 A (25%) 10. B (22%) 2.1 A (25%) 10. C (18%) 2.1 D (15%) 11. C (16%) 2.2 D (23%) 11. A (30%) 2.2 A (26%) 11. D (37%) 2.2 B (33%) 12. D (19%) 2.3 D (27%) 12. D (20%) 2.3 D (23%) 12. D (19%) 2.3 D (21%) 13. B (19%) 2.4 B (21%) 13. C (43%) 2.4 C (28%) 13. C (21%) 2.4 A (25%) 14. C (18%) 2.5 B (23%) 14. D (8%) 2.5 D (21%) 14. B (8%) 2.5 A (23%) 15. A (14%) 2.6 B (9%) 15. A (14%) 2.6 D (17%) 15. B (11%) 2.6 A (30%) 16. B (12%) 2.7 C (27%) 16. D (10%) 2.7 A (34%) 16. B (12%) 2.7 D (24%) 17. A (11%) 2.8 A (22%) 17. C (18%) 2.8 D (36%) 17. C (21%) 2.8 A (17%) 18. C (18%) 18. B (23%) 18. B (31%) 19. C (12%) 3.1 D (10%) 19. D (26%) 3.1 B (28%) 19. B (11%) 3.1 B (21%) 20. C (17%) 3.2 B (26%) 20. D (15%) 3.2 A (11%) 20. B (29%) 3.2 D (19%) 21. B (28%) 3.3 C (34%) 21. C (23%) 3.3 A (11%) 21. B (28%) 3.3 B (24%) 22. C (25%) 3.4 D (14%) 22. A (23%) 3.4 C (18%) 22. C (17%) 3.4 A (30%) 23. D (23%) 3.5 C (7%) 23. C (24%) 3.5 A (19%) 23. A (25%) 3.5 D (19%) 24. C (7%) 3.6 C (12%) 24. C (20%) 3.6 C (52%) 24. B (63%) 3.6 C (39%) 25. D (30%) 3.7 A (11%) 25. B (20%) 3.7 C (12%) 25. C (24%) 3.7 D (27%) 26. C (18%) 3.8 D (38%) 26. B (29%) 3.8 A (18%) 26. D (17%) 3.8 B (30%) 27. C (19%) 27. A (17%) 27. A (34%) 28. D (30%) 4.1 B (23%) 28. A (23%) 4.1 C (30%) 28. A (14%) 4.1 C (29%) 29. A (21%) 4.2 A (35%) 29. C (26%) 4.2 B (24%) 29. A (34%) 4.2 B (29%) 30. D (24%) 4.3 A (26%) 30. C (31%) 4.3 B (30%) 30. A (16%) 4.3 D (16%) 31. D (22%) 4.4 D (41%) 31. B (29%) 4.4 B (26%) 31. B (20%) 4.4 A (22%) 32. C (26%) 4.5 A (22%) 32. D (24%) 4.5 B (38%) 32. B (21%) 4.5 B (29%) 33. A (40%) 4.6 B (23%) 33. D (31%) 4.6 D (26%) 33. D (19%) 4.6 B (32%) 34. B (24%) 4.7 A (21%) 34. C (10%) 4.7 D (34%) 4.7 D (21%) 35. A (16%) 4.8 C (38%) 35. A (23%) 4.8 C (12%) 4.8 C (20%) 36. B (23%) 36. C (16%)