For 1G, 1H, 1I 2010

You may want to visit these links:

• If you have missed the Eureka animation on Conduction in class... you may want to watch it here.
• The links on the last page of your "Transmission of Heat" notes can be found in this entry.

For 1H and 1I

1H students please join this wiki:

http://sciencefor1h.pbworks.com/

1I students please join this wiki:

http://sciencefor1i.pbworks.com/

Further instructions will be given in the respective wiki pages. Thank you!

One-week term break

Just the first three days... enough to make me boom up in size!

There were morning and afternoon invigilation in school on Monday and Tuesday, and only morning invigilation on Wednesday. I didn't want to miss the chances to catch up with my dear friends over the holidays, so I've been rushing around for fabulous meals with my friends after invigilation in school.

On Monday, I met my NIE ex-classmates - fellow teachers - for dinner at Ion. I seriously miss them lots! Students may not understand but once you started working and life gets so busy, you will really miss those days when you see your classmates and friends so often in school and after school. School days were still the best for me!  Now you get to chill out with friends the entire afternoon after school but once you started working, everyone will be too busy and the only time to gather and catch up will be over a quick dinner.  And it's so difficult to gather because everyone's so busy, thus gatherings are rare and few. So appreciate your friends and the time you have while you are still a student~ Homework is seriously nothing compared to real work! Alright, enough of my nagging...

We couldn't catch up enough over dinner and went to Starbucks for more catching up on one another's life... and we saw these!

Tuesday's dinner was with Miss Ee at Ang Mo Kio Hub... what a feast! I think we ordered too much food. (-_-) And we could still squeeze in desserts after window shopping! Oh boy, no wonder I'm growing up... in terms of clothing size! XD

Random shots in the canteen on Wednesday... during the break time in between invigilation. Stall no.5 - the western food stall - was the only food stall that's opened over the one week term break.

There's no afternoon paper on Wednesday and I met 2 buddies - also ex-classmates and current teachers - for lunch at Changi Airport T3.

After the spicy lunch we hopped over to T2 for desserts and fries! Fattening~ (>.<)

Thursday was spent marking and mugging in Starbucks (a photo was uploaded in my Facebook ,"Mobile Uploads" album) and the rest of the week with my family. I miss my parents and brother to bits. It's great catching up with my dear friends and family... I'm looking forward to my next holidays already~ I'm sure you are too! =P

Volume of prism for 2A

Hey 2A, another slideshow created just for you!



Hope this helps when you are doing your homework - Workbook pg 84 & 85 - especially those who were not in class when I taught this topic on Friday.

Remember to comment in my previous entry too. Happy holidays!

Surface area for 2A

Took the photos and created this slideshow especially for 2A~

Please look at this slideshow and answer Q1, Q2, Q3 and Q4:


Leave a comment in this entry with your answers.

In the "Post a comment" box, type in the answers in sequence.
Q1:
Q2:
Q3:
Q4: (it will be good to show me the working)



If you still don't know how to comment here, you may send your answers to me via a message in Facebook instead.

Regarding Q1 about the cross-section, recall Q2 of your workbook, which was just covered on Friday morning for most of you.

Please comment before your 1-week term break ends. =)

As promised, if your 4 answers were all correct and they're submitted before the deadline, you'll receive an awesome sweet from me~!

Know your circle

Remember your area of circle, and its circumference too!

Moments in daily life

Moments = Turning effects of forces



It's helping us everyday in more ways that we can possibly count... your door on hinges, your spoon as a lever to open your tin can, your foldable tables and chairs, flipping open your laptop, even flipping open your books and folders etc... it's all about turning effects of forces.

Transmission of heat

This is for all my secondary 1 Science students. It may also be beneficial for secondary 3 Physics students.

Please do not get the 3 types of transmission of heat mixed up. Heat is transmitted through 3 different ways: conduction, convection, radiation.

A quick recap: Conduction occurs in solids, liquids and gases, while convection occurs only in liquids and gases. Radiation requires no medium, which means it can even pass through vacuum! Please remember how each of these ways transmit heat. I will not elaborate them here so if you need help, read your notes and textbook, or look for me in school!

Now, when we say a thing is a good conductor, it means this thing can transmit heat efficiently (quickly) by conduction. Similarly, an insulator or bad conductor is a thing that is inefficient (slow) in transmitting heat by conduction. You may lose marks if you used the word "conductor" in a wrong context.

When we are describing a thing that is transmitting heat through radiation, we do not use the word "conductor". To describe things that are giving out heat through radiation, we use words like "emitter" or "radiator". And to describe things that are taking in heat through radiation, we use the word "absorber".

For example, let's look at the teapot, which has a silver shiny surface and is made of metal. It is a good conductor of heat because of it's material, metal. If you put hot tea in it, the whole teapot would quickly be hot to touch as its body is a good conductor of heat. However, it is also a bad emitter of heat because of its silver shiny surface, and this helps to keep the tea warm for a longer time. The silver shiny surface also makes it a bad absorber of heat, and thus it also keeps cool beverages cool for a longer time.

Please approach me for help if you still could not understand when to use "conductor", "insulator", "emitter" and "absorber" when describing the things that transmit heat.

Lastly, please bear in mind that there is no such thing as a "non-conductor of heat"! The statement "an insulator is not a conductor of heat" or "an insulator does not conduct heat" is WRONG! Do not be confused between insulators of heat and insulators of electricity. In the topic on electricity which will be covered in your secondary 2 syllabus, insulators do not conduct electricity. But in our current topic on transmission of heat, insulators of heat are bad conductors of heat. Everything can conduct heat, and an insulator is just a bad/poor conductor of heat. Insulators still conduct heat! As long as there is a difference in temperature, heat (or thermal energy) will flow from the region of higher temperature to the region of lower temperature. A good conductor allow the heat to flow faster while a poor conductor takes a much longer time for heat to be transmitted from the region of higher temperature to the region of lower temperature.