# [J1] Lesson 19 (11 – 17 May) Updates/ Debrief

[J1 Physics PMCians] All about Circular Motion – without getting giddy!

What we did in 2 hours:

This week, we investigated motions in a circle. We discovered that any circular motion must consist of a resultant force towards the centre of the circle (called the centripetal force), which causes the direction of motion to change without any change in the speed.

What you take home:

1) Circular Motion Daily Dose

Please download and print the Daily Dose for your personal revision. The answers and working are at the back:

https://tinyurl.com/y9yeoarb

2) Circular Motion Lecture (for reference only)

https://tinyurl.com/y9oywn9u

Special Mention:

In our next lesson, we will examine an amazing law- the Law of Gravitation!!

Newton first discovered the universal law of gravitation, which he showed was the same law that applied to heavenly bodies. So, in one fell swoop, he unified the heavens and the earth!!

Gentle reminder that there will be NO Lecture Webcast for this week. Instead, we will be teaching the topic during our next Live Lesson.

Looking forward to our next lesson! Stay happy and strong! 🙂

[J1 Maths PMCians]

What we did in 2 hours:

We kicked off Differentiation with Techniques of Differentiation, recapping our fundamentals from secondary school and picking up new formulae, trigonometric and inverse trigo.

Additionally, we learnt how to differentiate implicitly, and revised some parametric equations.

What you take home:

Try-It questions for Techniques of Differentiation are linked here:

https://tinyurl.com/yaqxs7af

Special Mention:

We will complete our look at parametric equations and proceed with Applications of Differentiation this weekend.

Friday class students please note that Friday lessons will be suspended until end of May, please attend any of the weekend classes.

See You (online) and Stay Healthy!

Your Friendly Math Tutors

[J1 Chemistry PMCians] Are you maintaining equilibrium in your life?

What we did in 2 hours:

We have begun the first of the three chapters on equilibrium, which is observed in reversible reactions. We have looked in detail at the idea of dynamic equilibrium, and went on to discuss tools that allow us to describe the extent of a reversible reaction. Lastly, we familiarised ourselves with the calculations involving the equilibrium constant.

What you take home:

The solutions to the Everything you need to know series is found here:

https://tinyurl.com/y6u42zme

Special Mention:

Next lesson, let us look at the more complicated calculation questions, and focus the rest of the lesson on the exerted a change on a system at equilibrium.

Meanwhile, revisit dynamic equilibrium in this 4-minute video:

Stay healthy and strong!

Mr Leong

Home-Based Learning (HBL)

1) One Weekly PMC Lecture Webcast (www.pmc.sg/lecture)

2) One Weekly PMC LIVE Tutorial (www.pmc.sg/live)