Download - Forzas 131126050757-phpapp01
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AS FORZASAS FORZAS
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EFECTOS:
-Aceleracións
-Deformacións
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REPRESENTACIÓNVECTOR
sentidodirección
intensidade
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APARELLO DE MEDIDA:dinamómetro
UNIDADE:Newton (N)
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FORZAS SOBRE UN MATERIAL ELÁSTICO
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MATERIALPLÁSTICO
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plástico
elástico
ríxido
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rotura
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corte
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FORZAS MÁIS IMPORTANTES
GRAVIDADE
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ACELERACIÓN DA GRAVEDADE
A Terra9,8 m/s2
Mercurio4 m/s2
Venus8,2 m/s2
Marte3,8m/s2
Xúpiter26 m/s2
Saturno11,17 m/s2
Sol273,7 m/s2
Urano1,05 m/s2
Neptumo1,22 m/s2
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ACELERACIÓN DA GRAVEDADELúa: 1,61 m/s2
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PESO = MASA x GRAVIDADE
PESO
CANTIDADE DE MATERIA DUN CORPO
(permanece constante)
FORZA DE ATRACCIÓN(diferente en cada lugar do
Universo)
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EQUILIBRIO
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PESO
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PRESIÓNSólidosEmpuxe sobre a base
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bicicleta de carreiras bicicleta de montaña
triciclo
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PRESIÓNLíquidosEmpuxe sobre a basee as paredes do recipiente
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PRESIÓNlíquidos
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PRESIÓNGasesEmpuxe en todos os sentidos
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flotabilidade
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Forza centrípeta
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inercia
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rozamentoagarre
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Rodamentos:Reducen o rozamento
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Forzas magnéticas
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forzas nucleares
forza electromagnética
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PRIMEIRA LEI-LEI DA INERCIA(Principio de Galileo)Na ausencia de forzas exteriores, toda partícula continúa no seu estado de repouso ou de movemento rectilíneo e uniforme respecto dun sistema de referencia inercial.
LEIS DE NEWTON
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SEGUNDA LEI DE NEWTON - LEI DA FORZAA forza que actúa sobre un corpo é directamente proporcional ao produto da súa masa e da súa aceleración. F: m.a
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TERCEIRA LEI DE NEWTON-LEI DE ACCIÓN E REACCIÓN-Por cada forza que actúa sobre un corpo, este realiza unha forza igual pero de sentido oposto sobre o corpo que a produciu. (As forzas sempre se presentan en pares de igual magnitude e sentido oposto ... )
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SISTEMAS DE FORZASDA MESMA DIRECCIÓN DE DISTINTA DIRECCIÓN
DO MESMO SENTIDO
DE SENTIDOCONTRARIO
PARALELAS
DO MESMO SENTIDO
DE SENTIDOCONTRARIO
ANGULARES
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