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BIOMEKANIKA

Satuan adalah besaran fisis yang menyatakan

kuantitas suatu materi.

Dua sistem umum satuan:

1.Sistem internasional (SI)

2.Sistem imperial

Sistem internasional dibagi atas 2 adalah

1.Sistem MKS

2.Sistem !S

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Besaran "#$#$

Besaran Satuan SI*an+an ,eter (,)

Massa Ki%ira, ($)

-a$tu .eti$ (s)

Arus A,"ere (A)

Te,"eratur Ke%/in (K)u,%a& at M#% (,#%)

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#nt#& 'esaran turunan

Besaran Satuan

  Ke3e"atan ,4s

  *er3e"atan ,4s2

  Gaya Ne5t#n

  Eneri #u%%e

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Ada tia ti"e "enu$uran

1!*enu$uran $ua%itati6 ada%a&

  ! .idasar$an "ada tandatanda /isua%  ! Tida$ ,e,a$ai an$a

  ! Terantun "eni%aian #'ser/er

  ! Su'ye$ti62! *enu$uran se,i $ua%itati6

  ! In6#r,asi yan ter3atat s$a%a re%ati6

  ! Adanya "er$iraan nu,eri$ suatu &asi%  ! #nt#& s$#r 7 "ada s$a%a nyeri

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8! *enu$uran $uantitati6  ! Menuna$an an$a

  ! Ada a%at u$ur4instru,en

  ! Ada satuan "enu$uran

  ! Si6atnya #'+e$ti6

  ! Tini 'adan9 te$anan dara&9 d%%

 

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Hu$u, Ne5t#n tentan era$

1!Hu$u, Ne5t#n I

  Benda a$an teta" dia, atau 'erera$%urus 'eraturan a"a'i%a tida$ ada aya%uar yan 'e$er+a "ada 'enda terse'ut!

se3ara ,ate,atis ditu%is  :;<0

  ;<aya yan 'e$er+a

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2! Hu$u, Ne5t#n II

  *er3e"atan suatu 'enda'er'andin %urus dan seara&denan aya yan 'e$er+a "ada'enda terse'ut!

Besarnya ada%a&

t mam F 

∨∆==   .

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8!Hu$u, Ne5t#n III

i$a 'enda "erta,a ,ener+a$anaya "ada 'enda $edua9 'enda$edua a$an ,ener+a$an aya yansa,a "ada 'enda "erta,a teta"iara&nya 'er%a5anan!

Se3ara ,ate,atis ditu%is

 reaksiaksi   F  F    −

=

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Keteranan

;< aya (Ne5t#n),< ,assa 'enda ($)

a< "er3e"atan 'enda (,4s2)

=/<//#<"eru'a&an $e3e"atan

=t<"eru'a&an 5a$tu (s)

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Kasus

*era5at ,end#r#n r#stur denan

$e3e"atan a5a% 1 ,4s9 aar sete%a& > s$e,udian %a+unya ,en+adi > ,4s! Bera"a'esar aya d#r#n "era5at ter&ada"r#stur +i$a ,assa r#stur 1? $!

Solusi

  ΔV=V-Vo=4-1=3 m/s, Δt=4 s,

m=18 kg  N t 

m F    "#1$%

$.1&   ==

∨∆=

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Gaya ra/itasi ada%a&

Gaya tari$ 'u,i ter&ada" suatu'enda!

Massa ada%a&

u$uran +u,%a& ,ateri da%a, suatu'enda!

Berat ada%a& aya yan di,i%i$i suatu

'enda a$i'at ra/itasi 'u,i!

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Besar aya 'erat

Keteranan

5<aya 'erat (Ne5t#n),<,assa 'enda

<"er3e"atan ra/itasi (@9? ,4s2)

 g mw   .=

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Ta'e%! e6e$ ra/itasi

Apli!asi "ala#

!epera$atan

Pen%elasan

B#t#% in6us I &arus

ditini$an

Gaya ra/itasi ,e,un$in$an a%iran %arutan

.rainase 3airan .i%eta$$an %e'i& renda& dari tu'u& "asien

($ant#n urin "ada $ateterisasi)Menurani

"endara&an /ena

denan ,enini$an

$a$i

antun ,e,#,"a dara& $e atas ,e%a5an

ra/itasi se&ina su"%ai dara& ,enurun!

Mene,'a%i$ansir$u%asi dara& "asien

 yan "insan

Barin$an "asien datar dan ,enini$an$a$i a$an ,e,'antu a%iran dara& $e #ta$

 yan $e$uranan #$sien!

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Be'era"a $eadaan da%a, "era5atan "asien yan ,e,er%u$an "e,a&a,an ,enenai"entinnya "#sisi "usat ra/itasi9 se"erti

1!*#stur tu'u& yan 'ai$ saat ,enan$at'enda!

2!Me,asti$an sta'i%itas untu$ "asien yantida$ sta'i%

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Gaya ese$ ada%a& aya yan ti,'u% $arena$e$asaran 'idan ese$ yan ara&nya

'er%a5anan denan "erera$an 'enda!Besar aya ese$

Keteranan

6<aya ese$

 $<$#e6isien ese$ $inetis

;<aya d#r#n atau aya tari$

 N   f  k  g 

  ⋅=  µ 

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Ga,'ar y N ;  ; y<;sin C

  C6 D ;D<; #s C

  5

Gaya "ada su,'u y

N; y5<0

Gaya "ada su,'u D

;D6<,!a

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#nt#&

  Besar aya tari$ "era5at ter&ada"

r#stur ada%a& >0 N9 ara&nya se"erti"ada 'r di atas9 C<80#! Bi%a 'eratr#stur 100 N! Tentu$an 'esar aya ese$dan aya n#r,a% ( $<092) dan "er3e"atan

'enda!a5a'

Gaya "ada ara& y

N; sin C <5N <100>0 sin 80#

  <100(>0!097)

  <?0 Ne5t#n

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Besar aya ese$

;(<  $ N  <092! ?0

  <1F Ne5t#n!

*er3e"atan ;D6(<,!a

>0 3#s 801F<10!a

( )   2'%$"%

1($2)

 sma

a

−=

−=

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#nt#&

Se#ran "asien ana$ sedan ,en+a%ani tra$si$u%it di,ana u+unu+un ta%i yan terantun"ada $atr#% sa%in dii$at$an "ada $u%it 'etis$a$i "asien dan "e,'erat! Ku%it "ada $a$i di

atas "a"an ,esin tra$si ditari$ ,e%a%ui $atr#%#%e& "e,'erat denan ara& /erti$a% $e'a5a&! Massa 'etis $a$i 2 $ dan ,assa"e,'erat 8 $ (<10,4s2)! K#e6isien $inetis

'adan denan "a"an 097 ese$an $atr#% dan,assa ta%i dia'ai$an9 &itun%a&

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Ga,'ar N

 

T 6

 

5$

  5'

  6

-

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.i$

,$<2 $

,'<8 $ $<097

  Ara& D 5'6<(,$,')!a

80097!20<7!aa<> ,4s2 

-'T<,'!a

80T< 8!>T<1? Ne5t#n

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Men&indari u%$us de$u'itusMen+aa "asien teta" 'erera$ untu$

,enu'a& titi$ $#nta$ "asien dan te,"attidur!i$a "asien i,#'i%itas una$an 'anta%9,atras9 te,"at tidur $&usus yan da"at,enurani te$anan!

;#r,u%asi te$anan

 A

 F 

 P    =

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ara untu$ ,enurani aya ese$*enunaan r#daLu'ri$asi ("e%u,asan) ,isa%nya

! .a%a, tu'u&9 %endir ("aru9 +antun danusus) dan sa%i/a (untu$ "en3ernaan

,a$anan)!! airan sin#/ia% antara tu%an ra5an

"ada sendi sin#/ia%!

! *enunaan K +e%%y saat ,e,asu$ansuatu a%at dan $ateter $e da%a,tu'u&!

! L#si#n dan ,inya$ "i+at "ada $u%it!

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Keteranan

*<te$anan (N4,2

);<aya (N)

A<%uas 'idan te$an (,2)

#nt#&*er'andinan 'erat 'adan "asien A dan Bada%a& 28! Luas "er,u$aan tu'u& yan,eru"a$an titi$ $#nta$ denan te,"at tidur

"asien A ada%a& 2 $a%i "asien B! Tentu$an"asien ,ana yan u%$us de$u'itusnya "ara&!

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a5a'

  5A  5B <28

AA <2AB

an "ara& ada%a& "asien B9 *B<8*A 

 A

 F  P    =

$

1

2$

2===

 B

 B

 B

 B

 A

 A

 B

 A

 A

 A

 F 

 A

 A

 F 

 P 

 P 

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Siste, "enu,"i% ada%a& siste, yan,e,'eri$an $esei,'anan "ada suatu

'enda!Tu'u& ,anusia 'e$er+a siste, "enu,"i%se"erti tanan9 $a$i dan $e"a%a!

Ga,'ar

  Titi$ tu,"u

52 51

  r2   r1

 

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8 ,a3a, siste, "enu,"i% y 'e$er+a "ada tu'u&,anusia

1!Ke%as "erta,a siste, "enu,"i%  Titi$ tu,"uan ter%eta$ di antara aya'erat dan aya #t#t! #nt#& #t#t dan tu%an "ada'aian $e"a%a!

  M

 

5

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Keteranan

M< aya #t#t5< aya 'erat

#< titi$ yu,"uan

Keuntunan ,e$ani$

"er'andinan antara aya #t#t (M)denan aya 'erat (5)!

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Besar $euntunan ,e$ani$

  r5   rM

  5 M

w

 M  KM   =

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BEGITU IN.AHNABEGITU IN.AHNA

SEHINGGA AKU MEMUIMUSEHINGGA AKU MEMUIMU.ENGAN SUKURKU.ENGAN SUKURKU