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physics_ОГН_10 grade_Lw 1_Learning the motion of ball in viscous fluids’_lesson plan.docx
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Date: |
Lesson 15 |
Long-term plan unit: 1 F |
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Teacher name: |
Number present: |
absent: |
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Grade: 10 (ОГН) |
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Theme of the lesson |
Laboratory work 1: ‘Learning the motion of ball in viscous fluids’ |
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Learning objectives that are achieved at this lesson (Subject Programme reference) |
10.1.5.2 – to determine dependent, independent and controlled (constant) physical measurements and consider the measurement accuracy; 10.1.5.3 – to define factors that influence the results of the experiment and to suggest the ways how to improve it; |
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Lesson objectives |
Learners be able to: · * understand the mechanism of viscous fluid resistance; · * be able to use measurement and analysis skills in a laboratory workshop; · * know the basic rules of the laboratory workshop; · * be able to work with different laboratory equipment; |
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Success criteria |
During the workshop the student: i. Independently assembles the installation according to the proposed figure/scheme. ii. Makes initial measurements. iii. Able to calculate the measurement error. iv. Can repeat the measurements, making changes to the original experience. v. Highlights the trend in the experience. vi. Highlights facts hinder the conduct of the experiment. vii. Can offer ways to improve the laboratory work. |
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Values instilled at the lesson |
v to expand the horizons of students, v to develop pupils ' functional literacy, v to develop responsibility and independence in their learning |
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Language objectives |
Learn the basic words and terms related to the topic, apply basic knowledge on the design of the work. Subject-specific vocabulary & terminology: Students will use the following terms- · Viscosity · Laminar flow · Ball drop · Stopwatch · Ruler · Parallax · To repeat the experiment |
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Cross-curricular links |
Mathematics |
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Resources |
Laboratory workshop, balls of different diameter, viscous liquid (shampoo, oil, jelly, etc.), tripod, stopwatch, ruler. |
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Previous learning
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Students know the basic theory of fluid kinematics. |
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COURSE OF THE LESSON |
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Planned stages of the lesson |
Planned activities at the lesson |
Resources |
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Beginning 2 min
5 min
30 min
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The teacher introduces the lesson and welcomes students. The teacher may take the opportunity to check homework and/or make some corrections.
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(T) The teacher introduces students to the objectives of the lesson. The teacher fixes knowledge of specific terms. The teacher conducts a survey with the purpose of the repetition of terms in the English language. The teacher shows the students a photo of the main elements of the equipment, they call the name of the equipment and write in a notebook unfamiliar terms.
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photo equipment for the lesson: stopwatch, test tube, soap / oil/ water, ball, tripod |
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(T) The teacher introduces students to safety in the classroom. The teacher distributes the answer sheets, discusses the plan of work with the students.
PAY ATTENTION! FEATURES OF THE WORK.
(INS) When preparing the work you will need to prepare a viscous liquid in advance. It can be Wallpaper glue, jelly, or liquid soap.
Balls can be recovered from old bearings.
ADDITIONAL SAFETY INSTRUCTIONS. When getting soap on mucous membranes of the eyes, abundantly rinse with water.
(E/f) Laboratory operation
Note: 1) The teacher should pay General attention to the choice of variables 2) The measurement accuracy of the ruler is always up to mm. 3) With the approximate measurements you need to do 3 measurements and take the average of the values in this work for the greatest value. 4) Work out the basic rules to offer improvements to the work. In many works it is possible to use templates on hindrances and their elimination It: (a) Insufficient measurement to determine the trend. Measurements should be 5-6. Improvement is plotting and finding the gradient to determine the average value. (b) Parallax of vision. This is to improve the follow-up perpendicular observation. (c) If the process is fast, the person does not have time to record the result. The improvement in video or still images.
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Laboratory workshop, balls of different diameter, viscous liquid (shampoo, oil, jelly, etc.), tripod, stopwatch, ruler. |
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End 3 min |
At the end of the lesson, learners reflect on their learning: - What has been learned - What remained unclear - What is necessary to work on
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Reflection |
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Home work To study the concept of viscous liquid, make a table to determine the viscous liquids used in everyday life. |
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Differentiation – how do you plan to give more support? How do you plan to challenge the more able learners? |
Assessment – how are you planning to check students’ learning? |
Health and safety regulations |
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Most learners should be able to recall the main aspects of the specified areas Some learners will not be able to attempt all the questions.
Learners group according to their ability. Learners who are able will be given extra work. |
(1) evaluation of laboratory work according to criteria (teacher evaluation) (2) self-assessment of the lesson |
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Reflection
Were the lesson objectives/learning objectives realistic? Did all learners achieve the LO? If not, why? Did my planned differentiation work well? Did I stick to timings? What changes did I make from my plan and why?
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Use the space below to reflect on your lesson. Answer the most relevant questions from the box on the left about your lesson. |
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Summary evaluation
What two things went really well (consider both teaching and learning)? 1: What two things would have improved the lesson (consider both teaching and learning)? 1: what have I learned from this lesson about the class or achievements/difficulties of individuals that will inform my next lessons
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Head of Physics Department:
INSTRUCTIONS only FOR TEACHERS
Purpose. Observation of the dependence of the ball speed in different viscous liquids.
Devices and materials: viscous liquid, metal balls of the same diameter 6 PCs., tubes, tripod with clutch, ruler, caliper, stopwatch.
Note: viscous liquid can be obtained by diluting a small amount of Wallpaper paste, or cook jelly, or take any thick detergent. The density of the liquid laboratory calculates in advance.
Prepare a thick solution first, then dilute half of it with water in a proportion of 1/1. Get two liquids of different viscosity.
To work, first give a more viscous liquid, then less viscous.
Цель. Наблюдение зависимости скорости движения шарика в разных вязких жидкостях.
Приборы и материалы: вязкая жидкость, металлические шарики одинакового диаметра 6 шт., пробирки, штатив с муфтой, линейка, штангенциркуль, секундомер.
Примечание: вязкую жидкость можно получить, если развести небольшое количество обойного клея, или сварить кисель, или взять любое густое моющее средство. Плотность жидкости лаборант рассчитывает заранее.
Приготовьте сначала густой раствор, затем его половину разведите с водой в пропорции 1/1. Получите две жидкости разной вязкости.
Для работы сначала даете более вязкую жидкость, затем менее вязкую.
Experimental setup
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When calculating the error, use the Cornfield method, for this the number of measurements of the value must be at least 3 times.
The Cornfeld method consists in choosing a confidence interval, ranging from the minimum to the maximum measurement result, and an error as half the difference between the maximum and minimum measurement result:
EXAMPLE:
THE STUDY OF THE MOTION OF THE BALL IN FLUIDS OF DIFFERENT VISCOSITY
When a body falls in a viscous fluid, it experiences a drag force that counteracts the movement of the object. In a more viscous fluid, the bodies experience greater values of the drag force. In this experiment, you investigate how the velocity of a ball falling in a liquid depends on its viscosity.
(а) Secure the test tube in the tripod as shown, as shown in Fig.1.1.
(i) measure and write the height of the liquid h in the vial
h = ..................................................сm [1]
(b) (i) Mount the ruler vertically with the stand and clip.
(ii) Release the ball from a close distance from the liquid surface, as shown in Fig.. 1.2.
Measure and record the time t of the ball falling from height h. [2]
h = ..................................................сm
t = .....................................................s
(с) Calculate the percentage error for the time of the fall of the three balls, [3]
εt = .......................................................
(percentage error)
(d) Calculate the average speed of the ball [2]
v = .............................................сm×s-1
(е) (i) change your test tube to a test tube with another liquid.
(ii) Repeat steps (b)(ii) и (d), record your results. [2]
h = ..................................................сm
t = .....................................................s
v = ............................................. сm×s-1
(f) It is assumed that the velocity of the ball V is inversely proportional to the viscosity. Do the results of the experiment confirm this assumption? Explain your reasoning. [2]
..........................................................................................................................................
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(g) (i) Write what could be possible errors or limitations in the procedure in this experiment. [4]
1. ...............................................................................................................................
2. ...............................................................................................................................
3. ...............................................................................................................................
4. ...............................................................................................................................
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(ii) Suggest 4 improvements (solutions to these difficulties or errors). You can suggest using other equipment or other actions. [4]
1. ...............................................................................................................................
2. ...............................................................................................................................
3. ...............................................................................................................................
4. ...............................................................................................................................
Mark scheme
Manipulation, measurement and observation
Successful data collection
(а) (i) First h in cm or mm. [1]
(b) (ii) The first value is t (must be between 0.1 and 10 seconds). [1]
(с) (ii) The second value of h (should be approximately equal to the first) [1]
(е) (ii) The second value of t (less than the first). [1]
(е) (ii) Several time measurements in each liquid [1]
(е) (ii) Repeated measurements for t (first or second measurement) [1]
Data quality
(g) (ii) High viscosity gives less speed or V (use corrected values of V). [1]
Presentation of data and observations
The submission of calculation and reasoning
(d) The first value of V is calculated correctly. Calculations should be checked (if not, write in the correct value). [1]
(е) (ii) The second value V is calculated correctly. Calculations should be checked (if not, write the correct value). [1]
(с) The correct calculation to check proportionality [1]
The analysis, conclusions and evaluation
Ability to draw conclusions
(f) Conclusion [1]
Sensible comments relating to proportionality calculations and to the suggested relation. Incorrect ideas score zero.
Uncertainty estimates
(с) the uncertainty in percent for the t. [1]
Absolute uncertainty should be between 0.1 and 0.5 s, or if repeated readings have been made then uncertainty can be half the range.
It is necessary to Express uncertainty in percent.
Constraint definition
(g) (i) The corresponding points should be underlined and ticked. [4]
Some of them may be:
A. And Two sets of readings are not enough to determine the pattern.
B. In the Ball may not reach the speed limit. (hover)
C. With hardly time to see the impact of the ball on the bottom.
D. Human error in timing / reaction time.
E. Parallax (when reading positions).
F. Other reasonable source of error
Assuming improvements
(g) (ii) The corresponding points should be underlined or ticked. [4]
Some of them may be:
A. Take more value sets and plot / calculate coefficients.
B. Verify the speed limit by increasing the altitude / measurement speed value in two intervals to check the speed limit.
C. Use the video to slow down when the ball lands.
D. Measuring the time of fall from a greater distance.
E. Drop in front of a ruler / read at eye level.
F. Another improvement, well explained.
Not to take: re-reading '(if not used ' graph ').
Do not take: 'use a computer to improve the experiment "
![Calculate the average speed of the ball [2] v =](https://fs.znanio.ru/d5af0e/cf/53/1c4b04def0e475893eff1641c6507166ae.jpg)
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