Dynamique Newtonienne Flashcards

1
Q

Quantité de mouvement d’un solide

A

Somme des quantités de mouvement de chaque points du solide :
p = Mv(g)

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2
Q

Qu’est ce qu’un Référentiel Galiléen ?

A

Point matériel isolé ou pseudo-isolé au repos ou en mouvement rectiligne uniforme : Principe d’inertie -> les forces se compensent

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3
Q

2ème loi de Newton

A

dp/dt = somme des forces

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4
Q

3ème loi de Newton

A

F(a->b) = -F(b->a)

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5
Q

Unité de la Force

A

Newton = kg.m.s^-2

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6
Q

Force gravitationnelle (force attractive)

A

F(1->2) = -Gm1m2/r^2 u1->2

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7
Q

Poids

A

P = mg

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8
Q

Vecteur g ?

A

g = -GMt/Rt^2 u

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9
Q

Force exercée par q1 sur q2

A

F(1->2) = q1q2/4pi£(0)r^2 u

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10
Q

Force de Lorentz

A

F = qE + qv^B

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11
Q

Tension exercée par un fil

A

T = -Tu

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12
Q

Force de rappel

A

F = -k(l-l(0))u

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13
Q

Réaction du support

A

R = Rn +Rt

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14
Q

Pousée d’Archimède

A

Pi(a) = -ro(f)*V(g)

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15
Q

Force de frottement

A

A faible vitesse : f = -hv

A haute vitesse : f = h||v||v = hv^2

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16
Q

Vitesse limite d’un projectile lancé verticalement

A

C’est quand la dérivée s’annule

dv/dt = 0

17
Q

Equation différentielle d’un oscillateut harmonique

A

Téta•• + wo^2*Téta = 0

wo^2 = g/l ou k/m

18
Q

Dans un mouvement vertical ou horizontal avec un ressort il faut..

A

Définir une nouvelle variable X = (l - lèq)

Et cela donne toujours l’ED d’un oscillateur harmonique

19
Q

Quantité de mouvement

A

p = mv