Month: March 2022

Man in Elevator

I just took the elevator in my apartment building with the PhyPhox mobile app and recorded the acceleration in the z-direction as the lift went down and up. This was done in the middle of the night to reduce the chances of my neighbours getting into the elevator along the way and disrupting this experiment, and more importantly, thinking I was crazy. The YouTube video below is the result of this impromptu experiment and I intend to use it in class tomorrow.

I used to do this experiment with a weighing scale, and a datalogger, but with smartphone apps being able to demonstrate the same phenomenon, it was worth a try.

To complement the activity, I will be using this simulation as well. Best viewed in original format: https://ejss.s3.ap-southeast-1.amazonaws.com/elevator_Simulation.xhtml, this simulation done in 2016 was used to connect the changes in acceleration and velocity to the changes in normal contact force as an elevator makes its way up or down a building.

Sky-Diving and Terminal Velocity

https://www.geogebra.org/m/wavar9bx

This is a wonderful applet created by Abdul Latiff, another Physics teacher from Singapore, on how air resistance varies during a sky-dive with a parachute. It clearly demonstrates how two different values of terminal velocity can be achieved during the dive.

Incidentally, there is a video on Youtube that complements the applet very well. I have changed the default values of the terminal velocities to match those of the video below for consistency.

Also relevant is the following javascript simulation that I made in 2016 which can show the changes in displacement, velocity and acceleration throughout the drop.

A list of Physics websites by Singapore teachers

I had the pleasure of making the acquaintance of a fellow Singaporean physics teacher who has also created his own website to host his teaching and learning resources at ThePhysicsGrove.com. He had managed to complete coverage of the O level Physics syllabus in a series of YouTube videos and I see that he is also creating Google Quizzes, Quizzizz and Kahoots for some topics.

I thought this will be a good opportunity to list down the various websites that I have been following because students will find them useful as well. Among the authors are Evan Toh (whom I met at ICTLT), a talented artist who infused comic drawing in the explanation of physics concepts, and Lawrence Wee, a friend and mentor who got me started on making javascript simulations.

  1. XMPhysics (for A-level students) – by Hwa Chong Institution teacher, Chua Kah Hean at https://xmphysics.com
  2. Evan’s Space (for O-level students) – by Edgefield Secondary School teacher, Evan Toh at https://evantoh23.wordpress.com/
  3. The Physics Grove (for O-level students) – by Hillgrove Secondary School teacher, Jonathan Ho at https://www.thephysicsgrove.com/
  4. Open Educational Resources (for all students) – by Senior Specialist, Lawrence Wee at https://iwant2study.org/ospsg/

I feel that it is necessary to maintain this list because a casual search for Physics websites in Google will return the dozens of tuition service providers (some of which are run by my ex-colleagues!) rather than these free-to-use learning resources that have been created. Hopefully with these backlinks, Google’s search algorithm will direct more traffic to such websites in future, although I still don’t think we can compete against the competitive tuition industry in terms of search engine optimisation. At least, one can find them through this page.

If you happen to come across any other similar websites, please leave a comment below or let me know personally if you know me.

Potential Divider with Thermistor Applet

The wonderful thing about GeoGebra is that you can whip up an applet from scratch within an hour just before your lesson and use it immediately to demonstrate a concept involving interdependent variables. I was motivated to do this after trying to explain a question to my IP4 students.

The RGB colours of the thermistor reflects the temperature (red being hot, bluish-purple being cold)

https://www.geogebra.org/m/etszj23m

This was done to demonstrate the application of potential dividers involving a thermistor and a variable resistor. It can, of course, be modified very quickly to introduce other circuit components.

Newton’s 2nd Law Applet

For a full-screen view, click here.

<iframe scrolling="no" title="Dynamics Problem" src="https://www.geogebra.org/material/iframe/id/uthszwjq/width/640/height/480/border/888888/sfsb/true/smb/false/stb/false/stbh/false/ai/false/asb/false/sri/false/rc/false/ld/false/sdz/true/ctl/false" width="640px" height="480px" style="border:0px;"> </iframe>

This applet was designed with simple interactive features to adjust two opposing forces along the horizontal direction in order to demonstrate the effect on acceleration and velocity.

Reflection on the SLS Pedagogical Scaffold v2.0

The Student Learning Space Pedagogical Scaffold was designed and rolled out just as I joined the Learning Partnerships in Education Branch. I was involved in some of the training sessions such as the SLS Design Challenge in 2018 where it was shared with all the schools in Singapore. After 4 years, I am about to co-facilitate training with it again – this time, with version 2.0 and with our school’s teachers on its use.

The SLS Pedagogical Scaffold

Here are some quick thoughts that I wanted to jot down before that happens and that I will try to refine along the way.

  1. What is the SLS PS? It includes a series of questions intended to help both beginning teachers and experienced teachers think about how “active learning with technology” can be achieved. Breaking that phrase down down: active learning is where students are actively engaged in sense making as opposed to didactic teaching where the only input is auditory or visual. Done with technology if it serves us well, this means technology is optional. Despite the name, the SLS PS need not be done with SLS as well! But instead it encourages us to consider it in light of all the other tools out there to see which tool best serves our purpose.
  2. One thing we kept emphasising was to make success criteria explicit:
    1. To promote metacognition (i.e. students will also know if they learnt)
    2. Helps us not to over-plan. Squeezing too many SCs in one lesson would make it difficult to assess if students are learning.
    3. SCs are more than just SIOs from the syllabus document, but specific performance goals that can be observed by both learner and instructor.
  3. Even though the SLS PS’s Learning Experiences are named after Diana Laurillard’s 6 LEs, The “LE”s in the SLS PS work toward a lesson/unit/topical plan, each with a “flavour” or a main mode of teaching. The components of this plan would include different combinations of the following types of activities, meant to:
    1. Activate Learning
    2. Promote Thinking and Discussion
    3. Facilitate Demonstration of Learning
    4. Monitoring and Providing Feedback
  4. Therefore, a learning activities found inside an “Acquisition” lesson plan can be a “Discussion” or “Practice” activity as well.
  5. The Design Map gives everyone a visual overview of the timeline, types of activities, and level of interaction while highlighting the technology or resources used. This is mainly used for lesson sharing.
  6. One main purpose of the PS is to allows us to consider the key applications of technology, namely:
    1. Personalisation through fostering student agency, giving choice in the learning goals, process and pace through digital resources
    2. Differentiation through harnessing the interactivity and multimodal features of digital technologies to differentiate the
      1. nature of content,
      2. learning processes and
      3. products of learning
    3. Conceptual Change through multimodal representations of abstract concepts, allowing students to discern critical features, and patterns, and infer generalisations.
    4. Scaffolding in the digital learning environment to support thinking and guide interactions between students, teachers and content.
    5. Learning Together (collaborative learning) by integrating supports for students to collectively improve their ideas over time by sharing, building on, organising, and synthesizing their knowledge and developing understandings.
    6. Metacognition by integrating automated supports for students to make sense of and regulate their learning activities and group knowledge, and articulate their reflection through multiple modes.
    7. Assessment for Learning by capturing and analysing assessment data to provide a student- or group-targeted feedback about their level of understanding, learning processes and progress and resources for students to access an expert’s conceptual organisation and modulate their actions.