31 December 2010
02 October 2010
For the sec 1s
Click the link and scroll to the bottom of the page to try it out~
Click the checkbox "Show" once to display the measurement.
(Note that the applet shows measurements in mm, not cm)
Click the checkbox "Show" once to display the measurement.
(Note that the applet shows measurements in mm, not cm)
Please have sufficient rest, ample revision and be well prepared!
All the best for your EOY papers!
All the best for your EOY papers!
27 September 2010
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:
1I students please join this wiki:
Further instructions will be given in the respective wiki pages. Thank you!
11 September 2010
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
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
04 September 2010
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!
28 August 2010
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~!
26 August 2010
22 August 2010
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.
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".
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.
07 August 2010
Kinematics summary note
Summary note on distance-time graph and velocity-time graph for my sec 3 students; click for full size image. Pardon the untidy hand written note.
Happy long weekend and happy National Day on 9 August! (^_^)
31 July 2010
20 July 2010
Free fall on the moon
Watch again as the hammer and feather fall.
You may also like to read up on Galileo Galilei and find out why he's called the "father of modern physics".
19 July 2010
Greenhouse effect & global warming
Links in the last page of Mdm Koo's notes on Transmission of Heat:
Energy Efficiency - Reducing Heat Transfer
Energy efficiency by reducing heat transfer
Global Warming - The Greenhouse Effect
An interactive overview on National Geographic
What can you do in your everyday life to help reduce global warming?
Answer: BYOB!
18 July 2010
15 July 2010
In class on 15 July 2010
1E asked about 'girders' when we were looking at heat and its effects on bridges and girders. Here's a little more information to share:
Definition of "Girder" on Dictionary.com
"Girder" on Wikipedia
30 April 2010
19 April 2010
Earth Day
Links that were shared during assembly:
http://www.wwf.org
http://www.panda.org
http://www.envirolink.org
http://www.nationalgeographic.com
This was shared during assembly this morning:
Something you may not know:
Eating lesser meat helps too!
http://www.wwf.org
http://www.panda.org
http://www.envirolink.org
http://www.nationalgeographic.com
This was shared during assembly this morning:
Something you may not know:
Eating lesser meat helps too!
13 April 2010
Temperature vs Heat
This is for the benefit of those who were not around when I showed this in 3H today. Please thoroughly read your notes on Heat Capacity + Specific Heat Capacity. Do look for me at Staffroom 2 if you have any difficulties. This offer is valid till 7 May 2010.
08 April 2010
07 April 2010
04 April 2010
31 March 2010
Animation on conduction
Eureka! is a TV series that was produced and broadcast in 1980 to illustrate concepts in physics through humorous comic episodes.
30 March 2010
26 March 2010
Give your ice a lift
Explanation:
Salt is sprinkled around the thread/stick and salt water has a lower melting or freezing point than pure water. The ice cube melts at the places where salt is sprinkled. Temperature of this water above the ice cube is below 0°C.
When salt dissolves in more of the melted ice, the solution gets more diluted, increasing the freezing point closer to 0°C. As the water has temperature a few degrees below 0°C, it freezes again.
23 March 2010
16 March 2010
10 March 2010
Sound inquiry
Hi students,
Here are some of the links where you can hear and see more about sound wave: Sound Wave Applet | Online Tuning Fork | Virtual Keyboard
Learn more about Bell Jar Experiment here:
Science of Sound - Bell Jar | Bell in a Bell Jar - An Interactive Animation
We will take a look at the bell jar experiment when we go to the laboratory on 23 March 2010. Please fill in this pre-activity online worksheet before our lab activity on 23 March 2010.
Here are some of the links where you can hear and see more about sound wave: Sound Wave Applet | Online Tuning Fork | Virtual Keyboard
Learn more about Bell Jar Experiment here:
Science of Sound - Bell Jar | Bell in a Bell Jar - An Interactive Animation
We will take a look at the bell jar experiment when we go to the laboratory on 23 March 2010. Please fill in this pre-activity online worksheet before our lab activity on 23 March 2010.
03 March 2010
Cosmic rays
When going through EM spectrum slides (after the little pop quiz based on the EM spectrum song) with 3H today, we read that 2 of the sources of gamma rays are radioactive substances and cosmic rays and some of you have questions about cosmic rays.
I have found a link for you to read if you are interested in finding out more about cosmic rays: Read more about cosmic rays here.
25 February 2010
24 February 2010
Sound waves
"Educational film that covers the basics of acoustics. How sound propagates through a medium, pitch, timbre, loudness etc. Dated but accurate."
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