# [S3] Lesson 20 (18-24 May) Updates/Debrief

[S3 Physics PMCians]

What we did in 2 hours (PMC LIVE):

Over the week of 11 to 17th of May, we have concluded our discussions on Work Energy and Power through a Structured Question Discussion and 5 rounds of PMC Challenge. By now, the tutors sincerely hope you will remember the ‘6-terms COE equation’ whenever you are tasked to solve questions from this topic.

For this coming week, we will be going back to recap on Turning Effect of Forces through some structured questions discussion and PMC Challenge.

Do remember to print out the necessary discussion documents through the Teachable Website(http://www.pmcdigital.sg).

Special Mention:

Of course, should you have any queries while you are doing your practices, feel free to contact the tutors @ 9100 1235 (PMC HQ). We will always be there to guide you in your understanding.

The S3PH Tutors

(Mr Wong, Dr Li and Mr Gary)

[S3 Maths PMCians]

What we did in 2 hours (PMC LIVE):

We covered how circles are reflected along the line of reflection and its characteristics. With that, we completed the chapter on Equation of Circles.

To sum up what we have learnt:

• finding the centre and radius of a circle from general/standard form
• forming an equation of a circle with centre and radius
• the horizontal/vertical tangents of a circle, and why it is so useful
• applying other concepts from coordinate geometry.
• Reflection of a circle and the line of reflection

We had fun with our Breakout Room Challenges and Kahoot.

Please click the link here for the solutions to the sections below:

• Solutions toTakeaway Questions (Equation of Circles)
• Solutions toTest A (Equation of Circles)
• Solutions to Live Chat Challenge Part 2 (Equation of Circles)
• Solutions to Breakout Room Challenge (Equation of Circles)

Special Mention:

In lower sec algebra, we are all familiar with the special identities: (a+b)2 = a2 + 2ab + b2. We can also manually expand (a+b)(a+b) by rainbow method. What if we want to expand (a+b)3 ? Well, that is still ok, but we will not want to expand (a+b)9 this way!

In our next LIVE, we will go into new chapter on Binomial Theorem, learning how to expand (a+b)n for some larger integer n. We will learn some formulae for this, and thankfully we do not need to memorise most of them!

Your friendly PMC S3 Math tutors

[S3 Chemistry PMCians]

What we did in 2 hours (PMC LIVE):

We have completed our Quick Fire Quiz on Qualitative Analysis and begun our Mid Year Revision with our topical revision on all the chapters we have done thus far. It is a great opportunity to address misconceptions that you may have from school and build a strong foundation going forward.

We have now completed the topic on qualitative analysis and you should be able to complete the Take Home Gems. As mentioned in class, you should give important concepts such as mole calculations, solubility and reactions of acids and bases a quick read which will facilitate your learning in class.

Special Mention:

Here’s a quick infographic on strong and weak acids. Recall, strength of acids is the extent of dissociation of ions.

Stay healthy, stay safe, see you this weekend!

Regards,

Mr Jacob

Home-Based-Learning (HBL)

1) One weekly PMC Lecture webcast (www.pmc.sg/lecture)
2) One weekly PMC LIVE tutorial (www.pmc.sg/live)