Tommy ha chiesto in Matematica e scienzeFisica · 9 mesi fa

Fisica, quantità di moto?

Salve, vorrei avere un informazione. Per quanto riguarda la quantità di moto tot di un sistema, si conserva se la sommatoria delle forze esterne è uguale a zero. Ma se in un sistema agisce l'accellerazione di gravità, e quindi la forza peso, quella è una forza interna o esterna?

Aggiornamento:

Se agisce la forza peso, la quantità di moto tot del sistema lungo una direzione si conserverà?

4 risposte

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  • Anonimo
    7 mesi fa

    Planezio Pietro figlio di putt@n@. Le risposte dell'affiliato 'ndranghetista @sesquiossidodip Planezio Pietro di Quinto (Genova), Antica Romana di Quinto 11/B (mg + sesquiossidodip) sono totalmente sbagliate (come la domanda).

    Uno dei siti che informano dei crimini commessi da Planezio Pietro (che ha aperto gioielleria e ristorante con denaro di proveninenza sospetta)

    http://pietroplanezio.website2.me/

    il casellario giudiziale https://postimg.cc/image/npla7utmj/

    https://postimg.cc/image/xmwb19w6z/

    Planezio, devi andare in un nucleo territoriale antidroga SERT e farti curare le tossicodipendenze e la pederastia.

    La quantità di moto, la trasmissione della medesima negli urti elastici ed anelastici, la stessa energia cinetica non si calcolano in Forza Peso ma in valori di massa e velocità, salvo i casi nei quali la velocità è diretta conseguenza o interazione con la forza gravitazionale.

    Andrea1 mese fa

    Planezio Pietro è @Mattia

    https://armiestrumenti.com/2008/07/11/appunti-sull...

    Nel principio di conservazione della quantità di moto

    m1 v1 + m2 v2 = 0

    non si considera l'azione della forza gravitazionale.

    infatti se aggiungessi il valore di g nella formula

    m1 v1 g = m2 v2 g

    l'accelerazione gravitazionale si semplifica

    m1 v1 = m2 v2

    annullando il significato della puttànàtà che Planezio Pietro si è domandato da solo.

    Se m1 o m2 o entrambe si muovessero su una superficie con attrito, la Forza attrito = mg * k (effetto della forza peso)... per il principio di conservazione della quantita' di moto, escludendo altre forze, non verrebbe

     violato (da forza peso a d'attrito) poiche' il principio di conservazione sarebbe quello prodotto dalle velocità v1 e v2 all'istante dell'impatto (anche in presenza di forza d'attrito di scorrimento e/o volvente) e con questo,mafioso Planezio Pietro, ha fatto en plein con una nuova figura da idiota.

    Planezio Pietro @sesquiossidodip affiliato 'ndranghetista, mi spiace, ma hai puttànato un'altra volta (qui non siamo alla UNITRE di Genova, dove puoi sminkiare tutto quello che ti pare).

    Planezio, mai letto che il transito di un treno genera, sul suolo, un principio di reazione che gli imprime  una quantità di moto con vettore v di direzione opposta al moto del treno... AHAHAHAHAHAHAHAHAHA. Pietro, tu devi prendere il Gardenase antipilettico, non la cocaina...

    Andrea1 mese fa

    Planezio mai letto che la quantità di moto di un treno viene trasmessa al Pianeta Terra incrementando il suo momento angolare L = rmv AHAHAHAHAHAHAH Il moto del treno è indipendente dal moto rotatorio terrestre e semmai

    ne sarebbe influenzato se si muovesse nella direzione opposta, diretta o perpendicolare alla rotazione, ma la Terra, se un treno rallenta o accelera, mantiene la sua velocità rotatoria costante. Hai capito capra ?

    Queste troyate le ho già lette molte altre volte (se trascino i piedi da seduto, faccio slittare la Terra che andrebbe piu' veloce AHAHAHAHAHAHAHAHAHA) e le vomiti nei corsi abusivi di Astronomia all'UNITRE di Genova (sei pieno di querele, tu e i magistrati di Genova, per questi fatti).

    Di recente, il pazzo calabrese (Dottor K e Yaya), ha teorizzato che i rotori dei motori elettrici, dovrebbero, per principio di azione e reazione, ruotare nella direzione contraria del campo magnetico. Povero terr'one del tacco...

    Andrea1 mese fa

     il principio di azione e reazione GENERA INERZIA (massa inerziale), non un moto risultante di verso opposto a quello indotto dal campo magnetico. La forza del campo magnetico di un motore ad induzione deve essere superiore alla forza

    generata dalla massa inerziale del gruppo rotore... non lo sapevi ? (no, poiche' somaro con V° elementare). Vai al SERT di Quinto a dichiarare che sei un cocainomane all'ultimo stadio che ti ricoverano e ti curano...(mi offro come portantino al funerale).

  • Anonimo
    8 mesi fa

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  • Anonimo
    9 mesi fa

    Non diciamo eresie per piacere!

  • 9 mesi fa

    Se il sistema è, ad esempio, appoggiato al suolo (ad esempio su rotaie) la sommatoria delle forze esterne risulta zero, in quanto la gravità è esattamente bilanciata dalla reazione vincolare appunto delle rotaie.

    E la quantità di moto lungo la direzione che ha si conservaSe invece è in caduta libera, il sistema non è più rappresentato dall'oggetto in questione ma dal complesso dell'oggetto PIU' la Terra.In questo caso si conserva la quantità di moto complessiva:Aumenta la quantità di moto del sistema in oggetto verso il basso e quella di tutta la Terra (non metterti a ridere) verso l'alto.E la somma delle due resta invariata, anche se è molto cambiata quella del sistema.

    Tieni presente (corollario) che se, ad esempio, si tratta di un treno su rotaie che quindi rallenta per attrito, la quantità dio moto che perde la trasmette al suolo, che la acquista in senso opposto. Quantità puramente teoriche, ma in linea di principio il treno che "frena" spinge in avanti tutta la Terra.

    Lo so che è un ragionamento che sembra ridicolo, ma può servire ad impadronirsi dei concetti profondi.

    Ciao

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