This site is maintained by Henry Welman, former provincial manager (2017-2022) and subject adviser (2001-2016) for physical and technical sciences in the Free State, South Africa. Currently retired, but interested in the well-being of teachers and learners involved in these subjects. Please read the disclaimer at the bottom of the posts.
Wednesday, 29 October 2025
Revision Books 2025
Thursday, 26 January 2023
Congratulations Grade 12 results - 2022
The pass percentages for our subjects were:
- Physical sciences: 80,6% for second place in South Africa.
- Technical sciences: 97,0% for first place in South Africa.
Friday, 16 December 2022
Holiday wishes for the school holiday

Tuesday, 29 November 2022
Surprises in life!
Physics - The RootsScience is a mind-bogglingly wide field of knowledge and research. These people called scientists have measured some wholly inconceivable things, and our present technology is all built on it. But, where did it start? How did we get from "googoo gaga" to knowing the temperature at the core of the Sun?
Well... let's retrace these steps, shall we? What did we know when we knew practically nothing?
Distance is the primary and most obvious thing to measure. Mathematics was basically built on that. One distance being added to another gave us addition. Adding equal distances repeatedly gave us multiplication. Deducting one distance fron another gave us subtraction, and dividing a distance into equal sub-units gave us division. So don't tell me primitive civilisations didn't do math...
Physical science is basically applied mathematics at this point. Also surface area and volume was well understood, since for instance a smaller container obviously contains less water or anything else than a larger one.
Directly related to volume is mass. This is so basic that explaining it would be an outright insult.
The next step is measuring the other constant, obvious factor of life: time. Days, seasons, seasonal cycles. These were then refined into time units more applicable to tasks. An hour as defined today did not exist until very recently, but they did develop a standard unit and sub-units over the course of time.
Next up, "fast" and "slow" was defined by relating the above two measurements. Speed is at times the difference between life and death. Thus, a faster hunter would be superior in gathering food, or escaping from a dangerous animal. The formula was not conceived, but the concept had been born. This also gave rise to the concept of acceleration.
While the formulae were defined later, space, time and mass was well understood on a practical use level. And every kinematic formula can be expressed in terms of only these factors. Take out one, and you're for the most part stuck without an answer.
In conclusion, I'd like to say we are most certainly no better informed than "cavemen" in terms of what we are working with. Our only advantage has ever been that each generation has left applications of this knowledge for the next generation to take for granted and build upon.
So, next time you see your science exam paper, or class test, be assured that your physics are all as simple as space, time and mass.
** A special thanks to Mr Henry Welman who had fed the love of physics in me between the age of 12 and 15.
Friday, 9 September 2022
Tips and Tricks for Examination Success
Saturday, 27 August 2022
Quantitative Error Analyses: 2022 June Examination Grade 12
Teachers can use this data to identify areas to focus on for the final preparations for these learners.
Wednesday, 10 August 2022
Thursday, 9 June 2022
Correction of Printing Error
Friday, 27 May 2022
How to use Siyavula
Monday, 23 May 2022
Revision Material for Grade 12 Learners
Sunday, 27 March 2022
November 2021 NSC Exam's Marking Guidelines
Thursday, 17 February 2022
Drawing diagrams, circuit diagrams and chemical apparatus
The drawing facilities of MS Word are quite amazing and can take you a long way. The more you practise and using your imagination, the better you get at drawing diagrams. The downside is that it is time-consuming and one cannot always address all situations satisfactory. This post deals with a few hints to draw diagrams in your question papers.
Shapes in MS Word
Die following diagram was done by using MS Word and it gives a good idea of what is possible.
Graphs in MS Excel
When it comes to graphs where accurate readings are important, you cannot get better than MS Excel or perhaps Google Sheets. For this, I prefer Excel. Compile the necessary values with an applicable formula and use the spreadsheet's ability to draw a graph. Copy and paste as a picture into your question paper. Here is an example of something I have done for the vertical motion of two balls.
Chemsketch
During a visit to the Maryland State Department of Education in the USA in 2005, I was introduced to Chemsketch. Since then I have introduced numerous people to this. What an amazing piece of software! It can draw the structural formulae for organic compounds and it can even give you the IUPAC name of a structure. For learners, this is very useful to practise and name their structures. Using Chemsketch to draw the following structural formula takes a fraction of the time compared to what it takes by using MS Word.
Chemsketch is available free of charge on the internet; currently from
https://www.acdlabs.com/resources/freeware/chemsketch. You can also search for Chemsketch, download, install and there you go. It is distributed by ACD Labs. Chemsketch can also be used to draw chemical apparatus, etc. It has amazing pictures of apparatus.
TinyCAD
For years, I was searching for something (free) to draw electric circuits with. I can do it with MS Word, but it is time-consuming. A few years ago I found TinyCAD at https://sourceforge.net/ and this helps me to rather quickly draw something like this.
Chemix
From the above, I was basically covered with diagrams although I wanted to have something else to draw chemistry equipment with too. Then I discovered Chemix at https://chemix.org/. It is an online drawing app to draw test-tubes, flasks, etc. You can save your drawings online or just copy and paste a drawing to your question paper (I like to use the snipping tool of Windows). Here is something I have put together as an example.
I am missing something here and there, but the speed and easiness getting a diagram done is a huge bonus. Anything that I need extra is done by MS Word; don't forget about the apparatus in Chemsketch as well. All these facilities can complement one another when you use them together.
Circuit Diagram
Since I wrote this article in December 2018, I found another online app to draw electric circuit diagrams. It is called Circuit Diagram and is available at https://www.circuit-diagram.org/editor/. It is also easy to use. You can create a profile, save your diagrams for future use, and you can download them your circuits as png or svg images. As with TinyCAD, I draw certain parts of the diagram with this app, but I prefer to draw things like voltmeters and ammeters with MS Word in order to use more descriptive labels when needed. Here is something I have done with Circuit Diagram.
Updated Info from Dr Angela Stott
Do not miss out on all the wonderful opportunities, activities, training and teaching offered by Dr Angela Stott.
Wednesday, 16 February 2022
More Generous Grading in the 2022 Examinations
Friday, 11 February 2022
Diagnostic Report of the November 2021 NSC Examination
Parts one and three deal with Physical Science and Technical Science respectively. Teachers are invited to download and scrutinise these reports. A few sets of additional and alternative information will be available that compliments the information of the Free State marking reports. The latter refers specifically to data that has been obtained from Free State learners. The Diagnostic Report refers to data obtained nationally. Click here to go to the page where you can download them.
Friday, 21 January 2022
Thursday, 20 January 2022
Reports of the NSC Examination of 2021
General reports can be found here.
Thursday, 11 November 2021
Best Wishes: Grade 12
Monday, 8 November 2021
Broadcasts with Exam Tips for Grade 12


Here are the time slots for the 12th:

Monday, 25 October 2021
Dr Angela is helping!
Do not miss this opportunity! Dr Angela Stott can help you.

Matric Physical Sciences: 😵💫 Remember last year's difficult Work, Energy, Power question? 😖
👩🏻🏫 Explained here for you and used as an opportunity to clarify concepts about Force, Work, Energy and Power, the Work-energy theorem, and the 🔄 relationships between these concepts.🧩
1️⃣: Types of force, Kinetic energy, Work done by non-conservative forces: https://youtu.be/2oiHSzSsPzE
Full P1 PS matric exam prep playlist:
https://youtube.com/playlist?list=PLWQ2SVe978FxRCqBZ2now_HHXBIWfUr7W
Click here to read another post about support by Dr Stott.











