27
ﺍﻋﺩﺍﺩ/ ﺒﻥ ﺴﻌﻭﺩ ﺍﻟﻌﻠﻭﻡ ﻜﻠﻴﺔ ﺍﻟﻠﺤﻴﺎﻨﻲ ﻤﻴﺩ/ ﺍﻟﻔﻴﺯﻴﺎﺀ ﻗﺴﻡ Force and Newton's Laws 4 1 ﺍﻟﻼﺯﻤـﺔ، ﺍﻟﻤﻌـﺎﺩﻻﺕ ﻭﺍﺴـﺘﻨﺘﺠﻨﺎ ﺍﻟﺠﺴﻴﻤﺎﺕ ﺤﺭﻜﺔ ﻭﺍﻟﺜﺎﻟﺙ ﺍﻟﺜﺎﻨﻲ ﺍﻟﻔﺼﻠﻴﻥ ﻓﻲ ﺩﺭﺴﻨﺎ ﺍﻟﻤﺘﺠﺎﻫـﺎﺕ ﺨﻼل ﻤﻥ ﺍﻟﺤﺭﻜﺔ ﻭﺼﻑ ﺘﻡ ﺤﻴﺙ ﺍﻟﺤﺭﻜﺔ، ﻤﺴﺒﺒﺎﺕ ﻫﻲ ﻤﺎ ﻨﺴﺄل ﻟﻡ ﻭﻟﻜﻨﻨﺎr ، v ، a . ﺍﻟﺤ ﻤﺴﺒﺒﺎﺕ ﺴﻨﻨﺎﻗﺵ ﺍﻟﻔﺼل ﻫﺫﺍ ﻭﻓﻲ ﺠـﺴﻴﻡ ﻋﻠـﻰ ﺍﻟﻤـﺅﺜﺭﺓ ﺍﻟﻘـﻭﻯ ﺒﻴﻥ ﻨﺭﺒﻁ ﺤﻴﺙ ﺭﻜﺔ ﺍﻟﺤﺭﻜﺔ ﻓﻲ ﺍﻟﺜﻼﺜﺔ ﻨﻴﻭﺘﻥ ﻗﻭﺍﻨﻴﻥ ﺒﻭﺍﺴﻁﺔ ﻭﺤﺭﻜﺘﻪ. 4 2 ﺘﻁﺒﻕ ﺍﻟﺘﻲ ﺍﻟﻘﻭﻯ ﺒﻌﺽ ﻋﻠﻰ ﺃﻤﺜﻠﺔ ﻫﻭ ﺒﺤﺒل ﺜﻘل ﺸﺩ ﺃﻭ ﻤﺎ ﺠﺴﻡ ﺭﻓﻊ ﺃﻭ ﻤﻌﻁﻠﺔ، ﺴﻴﺎﺭﺓ ﺩﻓﻊ ﺇﻥ ﻓﻴﻬﺎ ﺍﻟﺤﺭﻜﺔ ﻤﺴﺒﺒﺔ ﻤﺨﺘﻠﻔﺔ ﺃﺠﺴﺎﻡ ﻋﻠﻰ. ﻗﻭﺓ ﺘﻭﺠﺩ ﺃﻨﻪ ﻴﻌﻨﻲ ﻭﻫﺫﺍ ﺤﺭﻜـﺔ ﻫﻨﺎﻙ ﻴﻜﻥ ﻟﻡ ﺇﺫﺍ ﻟﻸﺠﺴﺎﻡ. ﺍﻟﻘـﻭﺓ ﺭﻏـﻡ ﺍﻟﺠـﺩﺍﺭ ﻴﺘﺤﺭﻙ ﻓﻼ ﺒﻴﺩﻴﻪ ﺒﻨﺎﻴﺔ ﺠﺩﺍﺭ ﺸﺨﺹ ﺩﻓﻊ ﺇﺫﺍ ﺫﻟﻙ ﻋﻠﻰ ﻭﻤﺜﺎل ﺍﻟﺸﺨﺹ ﺒﻭﺍﺴﻁﺔ ﺍﻟﻤﺒﺫﻭﻟﺔ. ﺍﻟﺼﻭﺭﺓ ﻋﻠﻰ ﺜﺎﺒﺘﺔ ﺒﺴﺭﻋﺔ ﺍﻟﺤﺭﻜﺔ ﺃﻭ ﺍﻟﺴﻜﻭﻥ ﻤﻥ ﺤﺎﻟﺘﻪ ﻋﻠﻰ ﻴﺒﻘﻰ ﺠﺴﻡ ﻜلF = o ..................................................................................... (1) 4 3 ﻴﺘﻨ ﻜﺘﻠﺘﻪ ﻤﻊ ﻭﻋﻜﺴﻴﺎ ﻋﻠﻴﻪ ﺍﻟﻤﺅﺜﺭﺓ ﺍﻟﺨﺎﺭﺠﻴﺔ ﺍﻟﻘﻭﻯ ﻤﺤﺼﻠﺔ ﻤﻊ ﻁﺭﺩﻴﺎ ﻤﺎ ﺠﺴﻡ ﺘﺴﺎﺭﻉ ﺎﺴﺏ. ﺍﻟﺼﻭﺭﺓ ﻋﻠﻰ ﺭﻴﺎﻀﻴﺎ ﺫﻟﻙ ﻋﻥ ﻭﻴﻌﺒﺭF = ma ................................................................................... (2) ﺤﻴﺙF = ﺍﻟﻤﺅﺜﺭ، ﺍﻟﻘﻭﻯ ﻤﺤﺼﻠﺔm ﺍﻟﺠﺴﻡ، ﻜﺘﻠﺔa ﺍﻟﻌﻼﻗﺔ ﻤﻥ ﺍﻟﺘﺴﺎﺭﻉ(2) ﻭﺤﺩﺓ ﻭﺘﻜﻭﻥ ﻫﻲ ﺍﻟﺩﻭﻟﻴﺔ ﺍﻟﻭﺤﺩﺍﺕ ﻨﻅﺎﻡ ﻓﻲ ﺍﻟﻘﻭﺓkg.m/s 2 ﻋﻠﻴﻬﺎ ﻭﻴﻁﻠﻕ ﻨﻴﻭﺘﻥ ﺍﺴﻡNewton ﻟﻬـﺎ ﻭﻴﺭﻤﺯ ﺒﺎﻟﺭﻤﺯ(N) ﺃﻥ ﺃﻱ1 N = 1 kg.m/s 2

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    swaL s'notweN dna ecroF

    14

    v r

    . a .

    24

    .

    . .

    )1( ..................................................................................... o = F

    34

    .

    )2( ...................................................................................am = F

    )2( a m = F notweN 2s/m.gk

    )N( 2s/m.gk 1 = N 1

  • / /

    : xam = xF

    yam = yF

    zam = zF

    IS

    )sKM(

    N

    gk

    2s/m

    sgc enyD

    2s/mc

    hsitirB dnuop

    2s/tF guls

    44

    . .

  • / /

    54

    .

    .

    .

    : gm = F = W

    . g

    .

    1

    m 3.2 = d gk 042 = m N 031 = F .

    .

    Q= Fam

    0.45gk.m/s042gk031N

    m \=== aF

  • / /

  • / /

    o22ax

    n=n+D 2

    D=-= o xxxd

    \n=== 2da20.452.31.6m/s ) () () (

    2

    s 5.4

    : n=n+ ota

    0.17m/s ) ( ) (4.5

    1.6m/s1.6m/st

    =--=- o an-n

    \=

    Q= Fam \=-=- F0420.17071N ) () (

    x . )c(

    3

    gk 063 . n= o021mk/h s 71 n=26mk/h

    .

  • / / Qn=n+ ota

    to a

    n-n \=

    ) ( ) (=

    -=\

    71s 26mk/h021mk/h

    0.59m/s2 1mk

    0001m0063s

    1hh.s

    =- 3.14mk

    =-

    Q= Fam \=-=- 2 F063gk0.59m/s043N ) () (

    . 54

    : .

    .

    . 1

    ESF SEF

    :

    ESF = SEF

  • / /

  • / /

    2

    )gm = w( )N(

    )N( :

    3

    w . F

    swaL s'notweN fo noitacilppA64

    :

    -1 .

    . y ,x -2

    . -3

    4

    . C ,B ,A gk 51 = m . AT ,BT ,CT

  • / /

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    x ,y )b( x ,y . o = F:

    .o = xam = XBT + XAT = xF

    o = yam = yCT + yBT + yAT = yF )b(

    ,AT 668.0 - = 03 soc AT - = xAT

    ,AT 005.0 = 03 nis AT = yAT

    ,BT 707.0 = 54 soc BT = xBT

    ,BT 707.0 = 54 nis BT = yBT

    dna

    CT - = yCT ,o = xCT

    )c( o = yF

    gm = yCT

    N 741 = )2s/m 08.9( )gk 0.51( gm = CT \

    )x(

    x y

    o = BT 707.0 + AT 668.0- x

    o = CT BT 707.0 + AT 005.0 y

    CT N 231 = BT , N 801 = AT

    5

    P GK 5.7 = M : ( ) N12 =

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    51 = q ( ) ( )

    )b( ( ) :

    am = q soc P = xF - x

    yam = gm - q nis P + N = yF - y N96 = 51 nis )N12( N47 = qnis P gm = N \

    27.52.07m/s x

    12xsoc51m =q== aPsoc

    6

    gk 0.81 = m ( . ) ( . ) 72

    .

    . )b( ( ) .

    Q= Fo

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    x \=-q= xFTgmniso

    y yFNgmsoc \=-q= N08 = 072 nis )2s/m 08.9( )gk 81( = q nis gm = T \

    N 751 = )072 soc( )2s/m 08.9( )gk 81( = q soc gm = N

    ( ) :

    am = F

    x xam = q nis gm- = xF yam = qsoc gm-N = yF

    o = ya y .x . N751 qsoc gm

    2s/m 54.4- = )72 nis( )2s/m 08.9(- = qnis g- = xA

    . 7

    gk 2.27 ( ) ( ) .

    .2s/m 02.3

    o = yF ( ) o = gm N = yF

    N 807 = )2s/m 08.9( )gk 2.27( = gm = N \

  • / /

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    2s/m 2.3 = a ( ) am = yF

    am = gm N = yF \

    )2s/m 02.3 + 2s/m 08.9( )gk 2.27( = )a+g(m = N \

    N 939 =

    .

    74 swaL s'notweN fo snoitacilppA eroM

    .

    8

    . 1m . 2m

    . .

    . .

    : ( b )1m

    )1( a1m = T = xF x

  • / /

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    )2( o = g1m-n = yF y

    : )c( 2m

    )3( a2m = T g2m = yF

    :

    gmm

    am12

    2

    + )4( =

    gmm

    Tmm12

    12

    + )5( =

    9 )2m ,1m(

    . ) ( ) . enihcam s'doowtA(

    : )b(

    1 )1( a1m = g1m T = yF 2 )2( a2m = T - g2m = yF

    gmmamm

    21

    21

    +-

    )3( =

    gmm

    T2mm12

    12

    + )4( =

  • / /

  • / /

    01

    43 ( ) . . gk 6.2 = 2m ,gk 5.9 = 1m

    1m )c( )b( 1m (. a )x

    :

    x: )1( a1m = qnis g1m T = xF

    y : )2( o = qsoc g1m N = yF

    y 2m )3( a2m = T g2m = yF

    :

    gmmammnis

    12

    22

    +-q

    )4( =

    +q) (+

    g1nis =mm

    Tmm12

    )5( 12

    9.08m/s2.2m/s2 ) ( ) () (

    9.5gk2.6gk= 2 a2.6gk9.5gknis43

    +-

    =

    . : . 2 1

  • / / 9.8m/s1nis4313N ) () ( ) () (

    9.5gk2.6gk+= 2 T9.5gk2.6gk

    + =

    2m)N 62 = 2m( . 2m

    . gk 5.5 -1 N8.3

    ( . ( ( . s/m 2.5

    . b a gk 01 -2 s/m 52 a m 05 b

    . b

    .s01

    s/m 701 4.1 -3

    m 41-01 1 72-01 76.1 .

    .gk

    -4 N29 ,N09 . gk 52

    . h/mk 35 -5 ( )mc 56

    .

  • / /

    ( ) gk 93

    gk 2.5 =m . 1F ,2F m -6 .N 3.4 = 2F N 7.3 = 1F

    (. )

    gk 4.8 gk 04 -7 .N 2.5 m 51

    - -

    ( ) - .

    . gk 57 -8

    2s/m 27.3 = g - . -

  • / /

  • / /

    528.1 h/mk 0261 -9

    . 4-01 8.2 -01

    : 33 . - . -

    N 00031 h/mk 08 -11 m 12

    . - . . - h/mk 04 -

    . 2s/m 2.9 gk 52.0 -21

    = P gk 1.5 -31 52 = q N21

    -41 N 054 .

    . 83 gk 69 . N521

    .

  • / /

  • / /

    . gk 0061 -51 s/m 21

    .m 24 . a M -61

    a

    . -71 .

    gk 3.2 = 1m ,gk 2.1 = 2m ,N2.3 = F - .

    1m 2m - .a N1.2

    gk 07.3 = 1m -81 82 = q

    . gk 68.1 = 2m -

    -

  • / /

  • / /