Spring Final SG

8/11/2019 Spring Final SG

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S8P2c Forms of Energy ch9

1. Write an energy transformation involving each specic type of energy.

Mechanical energy is the sum of inetic energy an! potential

energy.

"inetic energy is energy of motion an! !epen!s on spee! an! mass.

Potential energy is energy of position. #ravitational potential energy

!epen!s on $eight an! height.

%hermal energy an! soun! energy can &e consi!ere! forms of

inetic energy.

'hemical energy( electrical energy( an! nuclear energy can &e

consi!ere! forms of potential energy.

)ou use a hair !ryer after you tae a sho$er( the electrical

energyinetic energy* thermal energy* soun! energy. )ou use! calculator that use the solar cells, Solar Energy+sunlight,

electrical energy. -egeta&le +plants, convert light energyinto chemical energy.

)our &o!y uses the foo! +veggie, you eat to convert chemical energy

intoinetic energy.

)ou release! a ru&&er &an! on a ne$ toy( the store! elastic potential

energyinetic energy.

)ou ri!e your sate&oar! an! you spee! !o$n the si!e of the half/pipe(

potential energy inetic energy.

2. What energy transformations have to happen for you to use a hair

!ryer at home0ea! P21

Electrical energy enters the hair !ryer an! is converte! intoinetic

energy as a small electric motor spins a fan &la!e. Electrical energy is also converte! into thermal energy in a gri!

of $ires that heats up. %he fan forces air across the hot $ires( an! hot air &lo$s out of the

no33le of the hair !ryer. )ou can hear the soun! energy that also

comes out.


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S8P2! 4a$ of 'onservation of Energy ch9

1. What types of energy are pro!uce! &y the sun0

4ight energy +solar energy,.

S8P5a Electromagnetic Waves 6 Mechanical

Waves ch22

1. 7o$ are mechanical $aves p !ierent from electromagnetic $aves

p:;20

Electromagnetic $aves +EM,: a $ave that consists of changing electric an!

magnetic el!s. EM waves require no matter through which totravel.

Mechanical waves< Waves that nee! a me!ium through $hich to travel.

2. 'ompare $ave spee! of soun! $aves p:=: an! light $aves.

Soun! $ave spee!< it !epen!s on the me!ium in $hich the soun! is

traveling. ;;1 m6s in air = !egree.


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4ight $ave spee!< in a vacuum is ;==(=== m6s.

;. 7o$ is the EM spectrum organi3e!0 P:;:/:;

The entire range of EM waves is called the electromagnetic spectrum.

%he electromagnetic spectrum is !ivi!e! into regions accor!ing to

the length of the $aves.

>t is arrange! from long to short $avelength +from lo$ to high

fre?uency.,

S8P5& @ehavior of 4ight ch221. What is the !ierence &et$een refraction( reAection( an! !iraction0

#ive an eBample of each.

Reflection p644

the bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does

not go through.

Ex: When you look in a mirror, you are seeing light that has been reflected twicefirst from

you and then from the mirror.
http://playasound%28%27/sh2/sh07_10/student/audio/glossary/hs/msgh_2673_en.mp3','','%239977aa')


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efraction< p:5the &en!ing of a $ave as the $ave passes &et$een t$osu&stances in $hich the spee! of the $ave !iers.

EB


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2. What is the !ierence &et$een constructive interference p:=(

!estructive interference an! resonancep:1( 890 #ive an eBample of

each.

( Interferenceis a wave interaction that happens when two or more waves overlap.

verlapping waves can combine by constructive or destructive interference.!

Constructive Interference

When waves combine by constructive interference,the resulting wave has greater amplitude

than the individual waves had.

E"# when light of one wavelength shines through two small slits onto a screen.

Destructive InterferenceWhen waves combine by destructive interference,the resulting wave has smaller amplitude

than the individual waves had.
http://upload.wikimedia.org/wikipedia/commons/4/46/Wavelength%3Dslitwidthspectrum.gifhttp://en.wikipedia.org/wiki/File:Laser_Interference.JPG


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EB


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2. What causes color of light to separate0 P:;

000 the color of an o&Dect is !etermine! &y the $avelengths of light +that

reaches your eyes,

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Spring Final SG