Hi! My name is Chua Kah Hean. I used to teach physics at Hwa Chong Institution. Students call me Mr Chua.

I “retired” from HCI on 4th July 2022.

No I have not joined the private tuition industry (why haven’t I? why?)

Over the years, I have wasted spent god knows how many thousands of hours creating resources for students preparing for the GCE A-level (pre-university) Physics examinations. For free on the internet. When private tuition pays >>$100 per hour. (why am I so stupid? why?)

I do love $$$. But I also feel very strongly that every student, whether from rich or poor families, should have equal access to the best learning resources. So, even in my “retirement”, I hope to continue to create resources on xmphysics.com.

But I can’t be doing it for free now. I need an income stream! So if you think what I’m doing is meaningful and my effort should be rewarded, pls support me by giving me $$$.

If you’re singaporean, you can paynow/paylah me!


If you’re my international audience, you can paypal me. (Paypal takes a minimum $3 cut though)

Or if you prefer, you can be my patreon.


xmLecturexmTutorxmDemo | xmFlashCard | xmTYS | xmComic | yayaPhysics


xmLecture brings together all the xmphysics resources. Click here to access.

icon 512 pink

01 Measurement | 02 Kinematics| 03 Dynamics | 04 Forces | 05 Work Energy Power | 06 Circular Motion | …

The idea is to deliver xmphysics lectures in pdf documents, packed with clear explanations, supported by clickable links to awesome physics demonstrations and animations.


In 2017 I started making whiteboard-style short videos to explain specific concepts. URLs to youtube playlists are provided below. (URL)


I also have a blog and youTube channel running physics demonstrations illustrating A-level Physics concepts. The videos are hosted on youTube (youtube.com/xmdemo), and the blog (xmdemo.wordpress.com) provides brief explanations about the videos.


My most improbable project. I created an android app that puts flash cards into students’ handphones.


Practice with the Ten-Year-Series is a must for students preparing for the A-level examinations.

I maintain a blog at xmTYS.wordpress.com to provide worked solutions. While hardcopy TYS are arranged either by years or topics, my online version is searchable by years, topics and even concepts. This allows students to quickly retrieve questions of similar types testing the same concept.


6 wave vs particle

During the 2015 Dec holidays, I started dabbling in comics depicting physics concepts. I have published them as blogs on xmcomic.wordpress.com.

In the comics, the physics are very loosely applied so I can foresee many “education experts” accusing me of planting wrong physics in students’ minds. Duh.

I can’t really draw so most of the time I copy from other drawings (some of the characters I drew are clearly characters borrowed from Lat, a malaysian cartoonist). I managed to force my daughter to draw a few for me. She draws very well but she is not very enthusiastic about the assignment. Sigh.


Some time in 2013, I made a series of videos with the format of me chatting with Yaya, my 9-year-old daughter over some A-level physics concepts. It was my first attempt at making physics-related videos, so many of them were quite rough and unpolished. But some of them are quite memorable and have sentimental values for me. (URL)

9 thoughts on “Hello!

  1. I saw your youtube upload video about “tuning fork resonance”, and it was very well filmed. I would like to know if you could permit the use of this video for my university class. I will of course credit your name on the presentation. The university I teach at is Temple University Japan.

    Your website is also excellently made and very fun to watch. Thank you for this effort.

    I look forward to hearing your reply. Thank you.
    Tatsuki Matsui

  2. Many thanks. Do you accept some online donation to support your site? If so, please provide a payment (e-payment) method.

  3. Hi Mr Chua, I work for BBC Studios in the UK. We’ve seen your longitudinal wave animation on YouTube and would love to be able to use this in an upcoming kids’ film we are making about sound for BBC Earth’s YouTube channels. Could you please send me an email: sarah[dot]battensby[at] bbc[dot]com
    Thank you!

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