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RESUMO DE FSICA ENSINO MDIO
1. Cinemtica (movimento)
Estuda o movimento dos corpos, sem se preocupar com a causa.
Grandezas principais:
Posi?o (s) onde o corpo est
Deslocamento (s) varia?o da posi?o
Tempo (t)
Velocidade (v) = s / t
Acelera?o (a) = v / t
Movimentos importantes:
MRU: velocidade constante
MRUV: acelera?o constante
2. Dinmica (foras)
Estuda as causas do movimento.
Leis de Newton:
Inrcia: um corpo tende a manter seu estado
F = m a: fora massa vezes acelera?o
A?o e rea?o: foras opostas e simultneas
Foras comuns:
Peso (P = mg)
Normal
Atrito
Tra?o
3. Trabalho e Energia
Relaciona fora e movimento.
Trabalho (T) = F d
Energia Cintica (Ec) = mv / 2
Energia Potencial (Ep) = mgh
Princpio da Conserva?o da Energia:
A energia n?o se perde, apenas se transforma.
4. Quantidade de Movimento
Q = m v
Importante em colises
Conserva?o da quantidade de movimento:
Se n?o houver fora externa, a quantidade de movimento total se conserva.
5. Termologia (calor e temperatura)
Estuda o calor e suas trocas.
Temperatura: grau de agita?o das molculas
Calor: energia em trnsito
Frmulas importantes:
Q = m c T
Dilata?o trmica
Mudanas de estado fsico
6. Ondulatria
Estuda as ondas.
Ondas mecnicas (som)
Ondas eletromagnticas (luz)
Grandezas:
Comprimento de onda ()
Frequncia (f)
Velocidade da onda (v = f)
7. ptica
Estuda a luz.
Reflex?o
Refra?o
Espelhos
Lentes
Aplicaes: culos, microscpio, telescpio.
8. Eletricidade
Estuda cargas eltricas.
Corrente eltrica (i)
Tens?o (U)
Resistncia (R)
Lei de Ohm:
U = R i
9. Magnetismo
Relaciona m?s e correntes eltricas.
Campo magntico
Fora magntica
Base para motores eltricos
10. Fsica Moderna (noes)
Relatividade
Energia nuclear
Fsica quntica
Importante para entender tecnologias atuais.
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