Physics Video Making Competition 2012

Hello my dear students,

Today is the due date for this school level competition held by Physics Department of SMK Batu Lintang. Here are the number of videos that we received this morning.

4Setia -1

4 Jujur - 0

4Cekap - 1

4 Amanah-3

4 Ikhlas-1

5Setia - 2

5 Jujur -0

5 Cekap-1

5 Amanah -1

5 Ikhlas-0

Congratulations to all of you who had make an effort to submit your masterpiece. No doubt, making a video is no easy job. I had my own making videos...to produce a 5 minutes video actually took few days! So, winning or not is not the big point. The more important things are you had gain more knowledge and experience here. 

1. Video from 4Setia

Fun With Archimedes' Principle

Yesterday lesson 'Application of Archimedes' Principle" with 4Setia was fun. By the end of the lesson my dear 4Setia knew that this principle is used in the rising/diving of a submarine, ascending/decending of a hotair balloon and in a hydrometer.

Interesting activity on creating a 'hot air balloon' by Samantha & Bernard of 4Setia 2011...

I wonder can anybody suggest a better way to make sure the hot air balloon they created fly upright?

From Chapter 3 (Forces & Pressure):

Archimedes' Principle  states that 

For any object (fully/partially) immerse in fluid (liquid/gas),
"Buoyant Force = Weight of fluid displaced"

From Chapter 2 (Forces & Motion):
a) If the object is floating, the net force = 0 since it is stationary
So "Buoyant Force = Weight of the object"

b)If the object is sinking/decending, net force is not zero
So "Buoyant Force < Weight of the object"

c)If the object is rising/ascending, net force is not zero
So "Buoyant Force > Weight of the object"

Means that in order to solve problem involving this principle,

 we need to really understand the definition & relate it to net force....

Experiment 3.1 

To determine the relationship between the weight of water displaced and the buoyant force

4Amanah 2011

Kevin, Michelle, Edwin, Jacelyn...

The result:

where 

a - Weight of the object in the air

b - Weight of the object in the water (Apparent Weight of the object)

c - Weight of the empty beaker

d - Weight of the beaker and the displaced water

e = apparent loss in weight = Buoyant Force = a - b

f = weight of displaced water = d - c

So from the table above, which group is the winner?

Haa...well done to group 5 & 6  for ur success in proving the Archimedes' Principle!

'Mimi Chocola', Zulfikar & Brenda...happy faces :)
I love to see students smiling faces..

Problem Solving

Format: Paper 2 (Section B)

Diagram 1 and 2 show two identical hydrometers are used to measure the density of Liquid P and Q.

Observe the diagrams and compare the followings:

1. The weight of the hydrometer.

2. The buoyant force acting on the hydrometer.

3. The level of the hydrometer (float higher/lower)

4. The volume of liquid displaced

5. The Weight of liquid displaced

6. The density of the liquid

Hence, State the relationship between the density of the liquid and the volume of liquid displaced.

Inventing A Hydrometer

4 Setia's students with their successfully made hydrometer using test tube, cotton & ball bearing.

Hydrometer is an instrument used to measure the density of a liquid.

Now my question are:

1. How are u going to callibrate ur hydrometer?

2. How to increase the sensitivity of a hydrometer?

3. What is the best material can be use to create a hydrometer, 

if it is use to measure the density of an acid?

Samantha, Siti Zubaidah, Megan & Victoria...

Annabelle, Joshua, Diyana, Derek....

Munirah, Haidah, Tan Xin Tian, Bernard, Ethel

Physics Video Making Competition 2011

My dear creative SMKBL's students,

Our Physics Department is organizing "Physics Video Making Competition 2011" for SMKBL Form 4 and Form 5 students...You can make a creative/ fun/ funny/ interesting video as long as it is related to Physics SPM syllabus. It can be about Force, Pressure, Heat, Light, Waves, Electricity, Electromagnetism, Electronic or Radioactivity...Here are the rules.

Rules:
1. Form a group consists of maximum 10 students
2. Discuss and create a 3-5 minutes video of physics using any software
3. Hand-in your application to me in a cd on or before 30 June 2011

Reward:
As a reward you will enjoy this:

1. You will be given perfect score for Construct No. 5 in PEKA.
2. Depends on the quality of physics knowledge in your video, it will be upload in this blog
3. Prizes will be given to 1st, 2nd and 3rd Best Physics Video Of The Year


Tips:

1. You can become the actor/actress/singer/playing music...
2. Add caption n background music to make it more interesting
3. You can cut the movie slot that hv physics principle and combine them using movie maker & add captions
4. Video about the experiment...Use Paper3, Section B format...from inference till the analysis (graph)...
    (You can get the apparatus from me...give me the material list)


If you have any problem, please do not hesitate to ask me. You can contact through emails, my blog and my facebook fanpage...anytime. All the best! Cheers!


SMKBL Physics Video of The Year Of 2010

This is made by students from 5 Amanah 2010 that consists of 

Bianca Teng, Bryan Teng, Caroline Ho, Dexter Law, Timothy Mejin & Joey...

Congratulations to the team for putting a lot of effort to produce this interesting video...

Double Rainbow

It was raining again today..Due to heavy traffic jam, I arrived at school at 7am...It took me half an hour to drive from the main road to the school entrance which normally took only 2 minutes :(....Luckily my day was 'brighten' by my 2 dear students...Alvin 5Cekap & Salina 5Setia were on duty at the hall. Salina ask me to look at the sky...Wah! Amazing...i saw not only one but two rainbows! A double rainbow! Really hope this double rainbow will cheerish our day...Let today be better yesterday. Cheers!

The following pictures were taken by Alvin...Thanks to Salina & Alvin...for adding in my interesting collection of pictures...

 Author Donald Ahrens in his text Meteorology Today describes

 a rainbow as "one of the most spectacular light shows observed on earth".

The white light is a mixture of the colors of the visible spectrum. Black is a total absence of light.7 colours in visible light spektrum can be seen in a rainbow.  Each "coloured light" has its own wavelength and its own frequency, so we call it "monochromatic light" which means "light with one colour/one wavelength".

Color	Frequency	Wavelength
violet	668–789 THz	380–450 nm
blue	631–668 THz	450–475 nm
cyan	606–630 THz	476–495 nm
green	526–606 THz	495–570 nm
yellow	508–526 THz	570–590 nm
orange	484–508 THz	590–620 nm
red	400–484 THz	620–750 nm

By the way, visible light is one of the 'member' of electromagnetic spectrum...We will learn this in subtopic 1.7. The following diagram shows the electromagnetic spectrum...observe where the red light lies...biggest wavelength in visible light spektrum.

Principle of Superposition

PHASE DIFFERENCE VS PATH DIFFERENCE

Phase Difference
Phase is the relative position in the cycle. 
Each time that the process attains the same position its phase will have advanced 360 degrees.
 
Take as periodic process as a walking person, and place the start of phase when the right foot touches the earth. When the phase advances 180°, the left foot touches the earth. When the phase advances 360°, the right foot touches the earth.

Now take two persons walking beside. They start touching the earth with their right foot simultaneously: they are in phase, their phase difference is zero.

If they are parading soldiers they will stay in phase and their right foots will continue to touch the earth simultaneously.
But if they are not parading, the pace period of each one will be probably different. If the period of person B is shorter, his right foot will touch earth a little before person A. We say that person B is in advance on phase relative to A. Or that phase of A lags B. If the periods of each one stay so, the difference of phase will increase. Eventually B will be 180° in advance (or B 180° in retard).

When two waves have the same periodicity, that is same frequency, and travel at the same speed, if they travel the same distance they will keep the same phase difference. 




Path difference


Path difference is the difference between the actual lengths traveled by the two waves in space.
Suppose you send two light waves from two different points.
Suppose you send wave A horizontally on the x-axis and suppose you send wave B not perfectly horizontally but with some angle from some point on the Y.axis. These two waves will meet at some point on the X-axis. 
But the distance travelled by the wave A will be less than that by Wave B.
This difference in the actual path they took is path difference.

1.1 Understanding Waves

 Voon created a simple 'trumpet' by using the concept of 'resonance'...

He forced the air in between the paper to oscillate with its own natural frequency...this result in the maximum vibration of the molecule, hence loud sound is produce...

5 Setia...happily observe the difference between the longitudinal & transverse wave...

4.3 Transistor (as an automatic switch)

"During night time, the resistance of the LDR increases, 

the potential difference across LDR increases, 

hence the potential difference across R1 decreases, 

there will be no Ib,

 Ic will not exist...

the bulb will not light up..." explain Audrey :)

My dear students, 

For a transistor to operate, its base circuit must be forward biased...That's why you need to focus ur explaination on the base circiut....Just like Audrey's explanation above.  

As for Dennis here, he purposely made mistakes in his explanation...Anybody can help him in his explanation?

My Fun Physics Lesson (Form 5)

Form 5
Chapter 2: Electricity

2.1 Analysing Electric Fields and Charge Flow

Electric Field Pattern

Chapter 1: Waves

12Jan 2010
1.3 Understanding Refraction Of Waves

This 5Setia student purposely made a mistake when she complete the refraction of water wave diagram. Can you guess who is this :) and what is the mistake?

Please remember class, refraction of waves occur when
1. light travel through different optical densities medium
2. water wave travel through different depth of water
3. sound wave travel through different density medium






1.3
6 Jan 2010
1. Creating Longitudinal & Transverse Wave Using Slinky Spring.

Picture shows Shane and his classmates 5 Amanah
success in creating the two types of wave...

Remember class!!!
Longitudinal Wave is a type of wave formed when the particle of the medium vibrate parallel to the direction of propagation of waves....transverse wave???19 Jan 2009













Video shows 5Setia's students lead by Lucas & Simon observing principle of superposition where constructive interference & destructive interference occur.

My dearest F5 students...do remember this,

There are 2 types of interference:

1. Constructive Interference =
phenomenon when
trough meets trough or
crest meets crest or
compression meets compression or
rarefaction meet rarefaction


2. Destructive Interference =
phenomenon when trough meets crest or
compression meets rarefaction

***Please don't write Constructive WAVES....The word `WAVE' is rejected.
Use Constructive `INTERFERENCE'