# 3.4. As forzas e a materia

## Glosario

## Magnitude

Definición:

  Calquera característica dos corpos, que se pode expresar en cantidades.

Exemplo:

  A lonxitude e a masa son magnitudes.

# Que a forza te acompañe

A forza é unha magnitude que pode modificar o movemento ou a forma dunha materia. A forza ten dous aspectos importantes: a dirección e o sentido.

## Dirección

Refírese á liña na que se aplica a forza, é dicir, a orientación na que se move o obxecto.

## Sentido

Indica se a forza fai que o obxecto se mova cara a un lugar ou cara a outro, dependendo de se se aplica de igual ou contraria á liña.

As forzas poden ter efectos diferentes sobre os obxectos:

- Cambio de movemento: a forza pode facer que un obxecto comece a moverse, acelere ou desacelere. Tamén pode facer que o obxecto pare ou que se mova en diferente dirección.
- Cambio de forma: a forza tamén pode modificar a forma dun obxecto. Se aplicamos a forza dun modo suficientemente forte, podemos estirar, comprimir ou deformar a materia. Non todos os corpos se comportan ante a acción dunha forza. Atopamos:

Corpos elásticos

Corpos ríxidos

Corpos plásticos

Os corpos elásticos son aqueles que, cando se lles aplica unha forza que cambia a súa forma, volven á súa forma orixinal despois de que a forza sexa retirada. Isto quere dicir que son capaces de deformarse, pero, en canto deixamos de aplicar a forza, recobran a súa estrutura inicial.

Os corpos ríxidos son os que, cando se lles aplica unha forza, non recuperan a súa forma orixinal. Este tipo de obxecto pode cambiar permanentemente a súa forma, de modo que a deformación é irreversíbel ou difícil de reverter.

Os corpos flexibles son aqueles que, cando se lles aplica unha forza, cambian de forma de maneira permanente, pero sen romper. A deformación que sofren non se pode desfacer, pero a materia mantén a súa continuidade.

## Lectura facilitada

A forza é unha magnitude. Pode modificar o movemento ou a forma dunha materia.

A forza ten dous aspectos importantes:

- Dirección: é a liña na que se move o obxecto.
- Sentido: se a forza se aplica na mesma liña que a dirección ou contraria.

As forzas poden ter efectos diferentes sobre os obxectos:

- Cambio de movemento: A forza pode facer que un obxecto comece a moverse, acelere ou desacelere. Tamén pode facer que o obxecto se pare ou que se mova en diferente dirección.
- Cambio de forma: A forza tamén pode modificar a forma dun obxecto. Non todos os corpos se comportan ante a acción dunha forza. Atopamos:
  - 1. Corpos elásticos: son aqueles que volven á súa forma orixinal despois de que a forza sexa retirada.
  - 2. Corpos ríxidos: son aqueles que non recuperan a súa forma orixinal.
  - 3. Corpos plásticos: son aqueles que, cando se lles aplica unha forza, cambian de forma de maneira permanente.

## Audio

audio/mpeg

# Clasifica os corpos segundo o seu comportamento cunha forza

Arrastra cada tarxeta ata o seu contedor.

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# Aceptas o Humpty Challenge?

Humty Dumpty proponche un "challenge". Es capaz de deformar un ovo sen que rompa? Ata agora aprendemos que o ovo é un corpo ríxido que se rompe se lle aplica unha forza suficiente pero... seríamos capaces de alterar a súa materia para que isto non suceda?

Investiga cos teus compañeiros e compañeiras de equipo como sería posible.

## Lectura facilitada

Humty Dumpty proponche un desafío.

Es capaz de deformar un ovo sen rompelo?

O ovo é un corpo ríxido que rompe se lle aplica unha forza suficiente.

Seríamos capaces de alterar a súa materia para que isto non suceda?

Investiga cos teus compañeiros e compañeiras de equipo como sería posible.

## Audio

audio/mpeg

Licenciado baixo a Licenza Creative Commons Atribución Non-comercial Compartir igual 4.0

Feito con eXeLearning (Nova xanela)