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L’ENERGIA
Ogni nostra azione o attività necessita, per essere svolta, di
una certa quantità di energia. Non possiamo fare a meno di
questa risorsa: per questo motivo è fondamentale che lo
sfruttamento dell’energia avvenga in modo responsabile e
sostenibile.
L’ENERGIA
L’energia è la capacità
di svolgere un lavoro.
A sua volta, il lavoro
è il prodotto di una forza
per uno spostamento
(L = F x s). La quantità
di lavoro svolto si misura
invece in joule (J).
L’ENERGIA
L’energia può presentarsi sotto le seguenti forme:
✔energia potenzale, cinetica e meccanica,;
✔energia termica;
✔energia chimica;
✔energia meccanica;
✔energia elettrica;
✔energia nucleare.
L’ENERGIA
Secondo il principio di conservazione dell’energia,
quest’ultima non si crea né si distrugge, ma si trasforma.
L’energia passa cioè da una forma all’altra senza
disperdersi veramente, permettendo all’uomo di usufruirne
in diversi modi.
L’ENERGIA
Inoltre, le fonti di energia
si dividono in:
✔non rinnovabili
(disponibili in quantità
limitate);
✔rinnovabili (disponibili in
quantità illimitate).
L’ENERGIA
L‘ENERGIA POTENZIALE
Si definisce energia
potenziale l’energia di
un corpo che si trova a
una certa altezza da un
punto di riferimento.
Si calcola facendo il
prodotto della massa del
corpo per la gravità e
per la sua altezza
Ep= m x h x g
L’ENERGIA CINETICA
L’energia potenziale
posseduta da un corpo in
movimento.
è data dal semiprodotto
della massa per il
quadrato della velocità
Ep= ½ m v2
ENERGIA MECCANICA
L'energia meccanica di un corpo è l'energia che un oggetto
possiede per il suo movimento o per la sua posizione.
è la somma dell’energia potenziale e di quella cinetica.
La somma dell’energia cinetica e potenziale è costante

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18_energia.pptx

  • 2. Ogni nostra azione o attività necessita, per essere svolta, di una certa quantità di energia. Non possiamo fare a meno di questa risorsa: per questo motivo è fondamentale che lo sfruttamento dell’energia avvenga in modo responsabile e sostenibile. L’ENERGIA
  • 3. L’energia è la capacità di svolgere un lavoro. A sua volta, il lavoro è il prodotto di una forza per uno spostamento (L = F x s). La quantità di lavoro svolto si misura invece in joule (J). L’ENERGIA
  • 4. L’energia può presentarsi sotto le seguenti forme: ✔energia potenzale, cinetica e meccanica,; ✔energia termica; ✔energia chimica; ✔energia meccanica; ✔energia elettrica; ✔energia nucleare. L’ENERGIA
  • 5. Secondo il principio di conservazione dell’energia, quest’ultima non si crea né si distrugge, ma si trasforma. L’energia passa cioè da una forma all’altra senza disperdersi veramente, permettendo all’uomo di usufruirne in diversi modi. L’ENERGIA
  • 6. Inoltre, le fonti di energia si dividono in: ✔non rinnovabili (disponibili in quantità limitate); ✔rinnovabili (disponibili in quantità illimitate). L’ENERGIA
  • 7. L‘ENERGIA POTENZIALE Si definisce energia potenziale l’energia di un corpo che si trova a una certa altezza da un punto di riferimento. Si calcola facendo il prodotto della massa del corpo per la gravità e per la sua altezza Ep= m x h x g
  • 8. L’ENERGIA CINETICA L’energia potenziale posseduta da un corpo in movimento. è data dal semiprodotto della massa per il quadrato della velocità Ep= ½ m v2
  • 9. ENERGIA MECCANICA L'energia meccanica di un corpo è l'energia che un oggetto possiede per il suo movimento o per la sua posizione. è la somma dell’energia potenziale e di quella cinetica. La somma dell’energia cinetica e potenziale è costante