Crea sito

Verifica sperimentale della spinta di Archimede                                                                                                                                                                                                                               

                                                                                                                                                                                                                                                                                                                                                                                                                               

Richiami teorici                                                                                                                                                                                                                                                                                                                                                                                                  

Principio di Archimede:                                                                                                                                                                                                                                                                                                                                                                                   

Un corpo immerso in un fluido in quiete riceve una spinta dal basso verso l'alto pari al peso del fluido spostato:                                                                                                                                                                                                                                                                                                                                                                                                                               

                                                                                                                                                                                          S= d*g*V                                                                                                                                                                            

Dove S č la spinta di Archimede, d č la densitā del fluido, g l'accelerazione di gravitā, V č il volume di fluido spostato.                                                                                                                                                                                                                                                                                                                                                                                                                  

Materiale:                                                                                                                                                                                                                                                                                                                                                                                                             

Un corpo metallico                                                                                                                                                                                                                                                                                                                                                                                            

un dinamometro di portata sufficiente                                                                                                                                                                                                                                                                                                                                                         

un recipiente cilindrico                                                                                                                                                                                                                                                                                                                                                                                     

liquidi di diverse densitā                                                                                                                                                                                                                                                                                                                                                                                  

 

Esecuzione                                                                                                                                                                                                                                                                                                                                                                                                         

Montiamo il dispositivo sperimentale                                                                                                                                                                                                                                                                                                                                                          

Misuriamo l'altezza, la base, la profonditā del corpo metallico e calcoliamone il volume                                                                                                                                                                                                                                                                                                   

Sul corpo sono tracciati dei segni di riferimento, a partire dal basso, distanziati di 1 cm uno dall'altro                                                                                                                                                                                                                                                                                                                                                                                                                                  

Sospendiamo il dinamometro al gancio di sostegno                                                                                                                                                                                                                                                                                                                             

Prendiamo nota del peso P0 del corpo indicato dal dinamometro                                                                                                                                                                                                                                                                                                      

Abbassiamo il gancio fino a che il corpo risulti immerso di h=1 cm                                                                                                                                                                                                                                                                                                 

Prendiamo nota del valore P1 segnato dal dinamometro. La differenza P0-P1 fornisce la spinta di Archimede S e il prodotto h*Ab                                                                                                                                                                                                                                                                                                                                                                                                                                 

il volume immerso V.                                                                                                                                                                                                                                                                                                                                                                                       

Ripetiamo l'operazione fino alla completa immersione di C.                                                                                                                                                                                                                                                                                                               

Tracciamo i grafici di S in funzione di V                                                                                                                                                                                                                                                                                                                                                     

Riportiamo le misure ottenute nella seguente tabella:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

N°prova

Ab(cm2)

h(cm)

V(cm3)

P0(g)

P1(g)

S=P0-P1(g)

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ChartObject Chart 2