Travail D'un Force et Théorème D'energie Flashcards

1
Q

Travail d’une force

A

W= Force x Distance x COSa

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2
Q

Travail d’une force si force resistante

A

W= -FxDistance

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3
Q

L’énergie cinétique

A

Ec= 1/2mv² en joul

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4
Q

Variation énergie cinétique (∆Ec)

A

∆Ec= Ecb-Eca= Σ Wab (VecteurF)

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5
Q

Travail moteur

A

α = 0° ou 0°<α<90°
W(F->) ≥ 0j

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6
Q

Travail nul

A

α = 90°
W(F->)= 0j

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7
Q

Travail résistant

A

90°< α ≤ 180°
W(F->) < 0j

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8
Q

L’énergie potentielle de pesanteur

A

EPP= mgh

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9
Q

Variation d’énergie potentielle (∆Epp)

A

∆Epp= Eppb-Eppa= m*g(hB-hA)
∆Epp= -W(P->)

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10
Q

Énergie mécanique

A

Em= Ec+Epp

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11
Q

Variation de l’énergie cinétique ∆Em

A

∆Em= Emfinal-Eminitial = ΣW(F->non conservatives)

Si ∆Em=0j alors il n’y a pas de frottements, la seule force exercée est le poids.

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