Leva
La leva la xe na machina semplice che te juta a fare dei movimenti. La xe fata de do brazi, solidali tra de lori (cioè che i zira col stesso angolo e la stessa velosità angolare) incernierà a un fulcro intorno al quale i xe lìbari de zirar.
Tipi de leve
In base al raporto tra forsa resistente e forsa aplicà (o potensa), le leve le se distingue in:
- svantagiose: se la forsa aplicà richiesta la xe pi granda de la forsa resistente, o sia se el brazo-resistensa el xe pi longo del brazo-potensa (bp / br < 1);
- indiferenti: se la forsa aplicà richiesta la xe conpagna a la forsa resistente, o sia se el brazo-resistensa el xe conpagno del brazo-potenza (bp / br = 1);
- vantagiose: se la forsa aplicà richiesta la xe pi picenina de la forsa resistente, o sia se el brazo-resistensa el xe pi curto del brazo-potensa (bp / br > 1);
In base a la posission reciproca del fulcro e de le forse le leve le se distingue in:
- leve de primo gènare: el fulcro el xe in mezo tra le do forse; le pole èssar vantagiose, svantagiose o indiferenti;
- leve de secondo gènare: la forsa resistente la xe in mezo tra fulcro e forsa applicà; le xe senpre vantagiose;
- leve de terso gènare: la forsa aplicà la xe in mezo tra fulcro e forsa resistente; le xe senpre svantagiose.
Wikimedia Commons el detien imàjini o altri file so leva
| Controło de autorità | LCCN (EN) sh85076325 · GND (DE) 1205381139 · BNF (FR) cb11980847c (data) |
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