welcome 5s1 to physics class 2014

8/12/2019 Welcome 5S1 to Physics Class 2014

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Welcome 5S1 to Physics Class Lesson

3


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rules & regulation

5 mins from class or hall

wait outside for teacher

do not enter lab without teacher's permission

stand up straight

quiet

when all in place, wish your teacher(Plan 2)
http://c/Users/user/Documents/pengurusan%20kelas%20&%20makmal/pelan%20kedudukan%202014.xlshttp://c/Users/user/Documents/pengurusan%20kelas%20&%20makmal/pelan%20kedudukan%202014.xls


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read the prayersit down when allowed only

text book/revision bookfile & testpads

1 long note book

*check your homework


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check

mind map from teacher about waves1.Do a mind mapon properties of wave:-

amplitude

period

frequency

wavelength

speed


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1.1 Understanding waves

Lets check out this video
http://c/Users/user/Videos/Energy%20in%20Waves-%20A%20Transfer%20Story%20(Spaced%20Out-%20A%20Cosmic%20Scene).MP4http://c/Users/user/Videos/Energy%20in%20Waves-%20A%20Transfer%20Story%20(Spaced%20Out-%20A%20Cosmic%20Scene).MP4http://c/Users/user/Videos/Energy%20in%20Waves-%20A%20Transfer%20Story%20(Spaced%20Out-%20A%20Cosmic%20Scene).MP4http://c/Users/user/Videos/Energy%20in%20Waves-%20A%20Transfer%20Story%20(Spaced%20Out-%20A%20Cosmic%20Scene).MP4


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What is waves?

WAVE


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Describing waves

Paste the handouts pg. 4 & 5 Nota Padat Fizik Waves


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Questions

Please paste in notebook (if not enough time do it as homework)

question 1 is shown by teacher. others done by pupils.


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let's interpret graph

copy the transparency for these graph


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in today's lesson, we have learnt about

describing waves

amplitude

wavelength period

frequency

speed


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interpret s-t and s-s graph

for next class, be prepared for pop quiz

and all the homeworks that given is

finished


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when going out...

stand at place & straight

quiet

put the chair under the table

wish thank you walk out in line

THANK YOU


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rules & regulation

5 mins from class or hall

wait outside for teacherdo not enter lab without teacher's permission

stand up straightquiet

when all in place, wish your teacher(Plan 3)


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from yesterday class, index write describing

waves (7/1/2014)

every page there is day and date

check, circle of wave

paste the handouts on describing waves (pg4 & 5)

paste questions on frequency, period and

waves speed and completed itlets discuss the answer


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see the graph

from yesterday question

if the above two graph describe the same

wave, what is the velocity of the wave?


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for today, write the index, Graph

copy this questions from syabas

transparency handouts

10 minutes to copy and answer it


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POP QUIZ

do the pop quiz then paste in your book

homework do the exercise page 7 & report

in a testpad for PEKA

inference

hypothesis

aim variables


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when going out...

stand at place & stand straight

quiet

put the chair under the table

wish thank you pass your book at the corner of the table

walk out in line


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rules & regulation (21/1/14)

stand up straight in place (plan 5)

quiet

wish your teacher

doa thank you for passing up PEKA

open notebook


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previous work

graph homework, exercises page 7

let's discuss the answer

PEKA please paste in book

today, index, Damping & Resonance

(21/1/14)(tuesday) Pass out handouts homework

pass out handout damping & resonance


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let's oscillate a spring system

observe what happen after we displacethe spring downwards

the spring will start to oscillate

after some time it will eventually stop if we want it to continue to oscillate we

have to force oscillation

if d h f it di l t


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so if we draw a graph of its displacement vs

time


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what is damping?

dampingdamping


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resonance

resonance


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Lab Zone

aim : to demonstrate resonance by using a

measuring cylinder filled with water procedure :

a 100 ml measuring cylinder is filled with about45 ml of water

a tuning fork i struck and held near the open endof measuring cylinder. the sound produce fromthe inside of measuring cylinder is notedcarefullyat close distance

this procedure is repeated using other tuningforks. the loudness of the sounds producedbydifferent tuning forks are compared


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observation

a very loud sound is produced by forcedoscillation of the air column inside the

measuring cylinder when one vibrating

tuning forks is used.

inference : an air column which is

subjected to forced oscillation at its natural

frquency will vibrate with maximum

amplitude to produce a loud soundwhereby resonance occurs


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Physics lab Resonance

Barton's Pendulum


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Resonance in slow motion
http://c/Users/user/Downloads/Video/Wine%20glass%20resonance%20in%20slow%20motion.MP4http://c/Users/user/Downloads/Video/Wine%20glass%20resonance%20in%20slow%20motion.MP4


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today, we have learnt about

damping

system undergo decrease in oscillation

resonance

a system oscillate at its maximum amplitude

when there is an external force acting on it. this external force must have the same

frequency with the system's natural frequency

The frequency at which an object tends to

vibrate with when hit, struck, plucked, strummedor somehow disturbed is known as the naturalfrequency of the object


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tomorrow, be prepared for POP QUIZ

stand up

put chairs under the table

be straight

be quiet wish thank you

walk out in line


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welcome

stand up (plan 1)

quiet

wish teacher

doa

open notebook

index, 26/1/14 - refraction of waves date submitted - 26/1/14


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make sure previous work all complete

every page there is date and day

if not, it will effect marks for your test

see your PBSmarks

make sure you already pasted the

exercise 1.1 from your file inyour notebook
http://c/Users/user/Documents/pengurusan%20kelas%20&%20makmal/PBS%20fizik%205S1%202014.xlshttp://c/Users/user/Documents/pengurusan%20kelas%20&%20makmal/PBS%20fizik%205S1%202014.xls


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refraction of waves

a video on reflection &

refraction
http://c/Users/user/Downloads/Video/Ripple%20Tank%20Reflection%20Refraction.MP4http://c/Users/user/Downloads/Video/Ripple%20Tank%20Reflection%20Refraction.MP4


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from the video

refraction is the

change in direction

depth increases,

velocity increases frequency remain

constant

so, wavelengthincreases


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distribute the handouts

refraction of waves
http://c/Users/user/Documents/physics%20classroom%202014/refraction%20of%20waves.dochttp://c/Users/user/Documents/physics%20classroom%202014/refraction%20of%20waves.doc


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Effects of refraction

refraction on sea waves

wave refraction
http://c/Users/user/Downloads/Video/Refraction%20of%20Sea%20Waves.MP4http://c/Users/user/Downloads/Video/Wave%20Refraction.MP4http://c/Users/user/Downloads/Video/Wave%20Refraction.MP4http://c/Users/user/Downloads/Video/Refraction%20of%20Sea%20Waves.MP4


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from the video, we know that

refraction of water waves can

be seen through sea water


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Effects of refraction

refraction of water waves of sea water1.When water waves propagate from sea to

beach, the water waves follow the shape

of the beach2. It is because the water waves propagatedfrom the deep water to the shallow water

3. The speed and wavelength decrease as

the waves approach the beach and hencewater wave is refracted towards normal


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conclusion

refraction is the change in direction when

speed of waves changes when travel at

different depth

deep area, velocity is high, so wavelength

increases

phenomena ofrefraction can be seen at

the changing of shape of waves when thewaves approaches the shore


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homework

do exercise 1.2, 1.3 from your file

after school re opens i'll check yesterday's

homework note on GCKL 2010

be prepared for POP QUIZ on refraction of

waves after school re opens


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before going out

pass up your book at the corner of the

class

stand up

put chairs under table

thank you

walk out in line


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plan 2 POP QUIZ refraction GCKL 2010 practis

structure

discuss note GC KL 2010, paste in book

hand them photocopy of PEKA on

pendulum, refraction of light (put in file)

l


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welcome

stand up (plan 7)

doa

take out red pen or pencil and let's discussthe exercises given

pass up your book at the end of the lessontoday

make sure there is index and date for

every page index for today is 23/2/14 Sound Waves

b d it j l h ti t t h 2014


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bayaran duit majalah tinta tahun 2014

tolong bayar rm 12.00 untuk majalahsekolah

kalau adik beradik sudah beli, maka tak

perlu beli, tetapi kena beritahu saya kelas

dan nama adik beradik.

S d W


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Sound Waves

Sound wave is a mechanical wave thatrequires a medium for its propagation.

Therefore sound wave cannot propagate

in vacuum.

The medium for propagation can be solid,

liquid or gas.

Sound waves propagate fastest in solid

and slowest in gas.

S d W L it di l W


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Sound Wave as a Longitudinal Wave

Sound wave is a series ofcompression andrarefaction of layers of airmolecules repeatedlythrough space.

The forward andbackward vibration of theair molecules in thedirection of motion of a

sound wave shows thatsound is a longitudinalwave.

T f S d W


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Types of Sound Wave

Human ear is capable of hearing sound with

frequency in the range of 20Hz 20,000Hz, andthe sound wave with frequency in this range iscalled an audio/Sonic wave.

Sound wave with frequency lower than 20Hz iscalled an Infrasonic Wave.

Sound wave with frequency higher than20,000Hz is called an Ultrasonic wave.

Infrasonic Audio/Sonic Ultrasonic20 kHz

S d f S d W


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Speed of Sound Wave

Speed of sound wave in solids is greater than in

liquids, which is greater than in gases.

Speed of sound in air is not affected by

pressure, but is affected by the temperature.

As temperature increases, speed of sound in air(and other gases) is also increases.

Sound usually travels more slowly with greater

altitude, due to reduced temperature.Speed of

sound can be calculated by the equation

v = f

Pit h d L d


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Pitch and Loudness

Loudness is influenced by

the amplitude of thesound wave.The greaterthe amplitude of soundwave, the higher theloudness of the wave.

The pitch of a sound ishigh or low of the sound.The pitch of sound isdetermined by itsfrequency. The higher thefrequency, the higher thepitch.


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Reflection of Sound

Wave

The clicking sound of thestop watch can be hearedclearly when the angle of

incidence, i is equal to theangle of reflection, r.

Sound waves obey thelaw of reflection. That is,

the angle of incidence isequal to the angle ofreflection.

Refraction of Sound Wave 1


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The amplitudeof the soundwave increaseswhen a balloon

filled withcarbon dioxideis placed

between thespeaker andthe

microphone.

Explanation:


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Explanation:

Carbon dioxide is denser

than air. The sound wave is

refracted approaching thenormal when the wavepropagates from the air

into the balloon, andaway from normal whenmoving out from theballoon.

As a result, the balloonacts as a biconvex lensand converge the soundwave at a point.



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The amplitudeof the soundwavedecreases

when a balloonfilled withhelium gas is

placedbetween thespeaker and

the


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Helium gas is less dense than

air. The sound wave is refracted

away from the normal when

the wave propagates from the

air into the balloon, and closer

to the normal when moving outfrom the balloon.

As a result, the wave is

diverged to a wider area and

causes the amplitude of the

sound wave decreases.


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Diffraction of Sound Wave

The street cleaner can hear the sound ofthe radio even though it is behind an

obstacle.

Explanation:

The sound of the radio spreads around thecorner of the wall due to diffraction ofsound wave.


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Interference of Sound Wave


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Interference of Sound Wave

Alternating loud and soft soundsare detected as themicrophone is moved from leftto right.

Explanation:

The two loud speakers are

sources of two coherent soundwaves as they are connectedto the same audio signalgenerator.

The alternating loud and softsounds are caused byinterference of the soundwave.


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Formula of

Interference

Wavelength of the

sound wave is given

by the equation


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please pass up your exercise book. (TO

WHOM IT MAY CONCERN)

(ACTION WILL BE TAKEN TO THOSE

WHO FAIL TO SUBMIT EXERCISE

BOOK)

today do 1.4 exercises from your file

refraction natural phenomena


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refraction - natural phenomena

air closer to the ground is cooler

travel slower in cool air

refracted


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properties of

e/m waves

transvers

e waves

travel with

speed of

light , 3 x

10 power of

8 m/s

do not

require a

medium to

propagate

and can

travel in

vacuum

today 9/3/14


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today 9/3/14

please do exercises 1.2 - 1.4 from your

file