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M3P2
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0789c219
Commit
0789c219
authored
May 19, 2024
by
Claude Meny
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Update 12.temporary_ins/40.classical-mechanics/30.n3/40.point-dynamics/20.overview/cheatsheet.fr.md
parent
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#18350
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cheatsheet.fr.md
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12.temporary_ins/40.classical-mechanics/30.n3/40.point-dynamics/20.overview/cheatsheet.fr.md
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0789c219
...
...
@@ -155,11 +155,11 @@ d'une *vitesse $`\overrightarrow{\mathscr{v}}`$* s'exprime :
<br>
En décomposant la quantité de mouvement comme le produit de la masse par la vitesse, tu obtiens :
<br>
*$`
\
o
verrightarrow{F
}
`$* $`
\,
=
\d
frac{d
\o
verrightarrow{p}}{dt}
`$
*$`
\
m
athbf{
\o
verrightarrow{F}
}
`$* $`
\,
=
\d
frac{d
\o
verrightarrow{p}}{dt}
`$
$`
\h
space{1cm} =
\d
frac{d (m/,
\o
verrightarrow{v})}{dt}
`$
$`
\h
space{1
.8
cm} =
\d
frac{d (m/,
\o
verrightarrow{v})}{dt}
`$
*$`
\h
space{1
cm} =
\d
frac{dm}{dt}
\c
dot
\o
verrightarrow{v} + m
\c
dot
\d
frac{d
\o
verrightarrow{v}}{dt
}
\q
uad
`$* (éq.1)
*$`
\h
space{1
.8cm} =
\b
oldsymbol{
\m
athbf{
\d
frac{dm}{dt}
\c
dot
\o
verrightarrow{v} + m
\c
dot
\d
frac{d
\o
verrightarrow{v}}{dt}}
}
\q
uad
`$* (éq.1)
<br>
!!! *Exemple :*
!!! Le corpuscule peut modéliser de façon simplifiée une fusée.<br>
...
...
@@ -170,9 +170,13 @@ $`\hspace{1cm} = \dfrac{d (m/,\overrightarrow{v})}{dt}`$
!!! C'est donc l'équation 1 qui donne l'expression de la force qui la propulse.
* Pour un *
corpuscule de masse constante
* :
* Pour un *
*corpuscule de masse constante*
* :
<br>
*$`
\l
arge
\m
athbf{
\o
verrightarrow{F}=m
\d
frac{d
\o
verrightarrow{v}}{dt}=m
\o
verrightarrow{a}}
`$*
$`
(m = cste)
\;\L
ongrightarrow
\;
`$ *$`
\m
athbf{
\d
frac{dm}{dt} = 0}
`$*
<br>
donc,
<br>
**$`
\l
arge
\m
athbf{
\o
verrightarrow{F}=m
\d
frac{d
\o
verrightarrow{v}}{dt}=m
\o
verrightarrow{a}}
`$**
#### Quelle est la troisième loi de Newton ?<br>**(Principe d'action et de réaction)**
...
...
@@ -180,7 +184,7 @@ $`\hspace{1cm} = \dfrac{d (m/,\overrightarrow{v})}{dt}`$
* Soient *deux corpuscules* 1 et 2 *en interaction*.
Les forces d’interaction F ⃗_(1→2) et F ⃗_(2→1) sont opposées :
<br>
**$`
\l
arge
\m
athbf{
\o
verrightarrow{
f}_{1
\r
ightarrow 2}=-
\o
verrightarrow{f
}_{2
\r
ightarrow 1}}
`
$
**
**$`
\l
arge
\m
athbf{
\o
verrightarrow{
F}_{1
\r
ightarrow 2}=-
\o
verrightarrow{F
}_{2
\r
ightarrow 1}}
`
$
**
#### Quels sont les différents types de forces ?
...
...
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