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FÍSICA I QUÍMICA 4t ESO. EXAMEN CINEMÀTICA.
Nom:_____________________________________________________ Nota:_________
1. Un cos es mou segons aquesta equació de posició r=2t i + (3t2-1)j+(t - 2)k m.
Calcula:
a) El vector desplaçament i la distància recorreguda en els cinc primers
segons i durant el primer minut de començar el moviment.
b) La velocitat mitja i el seu valor en els cinc primers segons
d) L’acceleració mitja i el seu valor en els cinc primers segons.
2. Un cotxe ix de Xàtiva cap a Ontinyent a 90 km/h i un altre ix d’Ontinyent cap a Xàtiva a
20 m/s, si la distància que hi ha entre ells és de 30 km, calcula la distància a la que es
troben i l’instant al que es troben els dos cotxes. Quina distància recorre cada cotxe?
Dibuixa els gràfics corresponents.
3. El conductor d’un camió que circula a 90 km/h observa un gos que creua
inesperadament la calçada. Frena i tarda 4 segons per parar. Si el gos es troba a 60 m,
l’atropellarà?
Si tenim en compte ara el temps de reacció del conductor que és de 1 segon en les
mateixes condicions, atropellarà al gos?
4. Un cos es deixa caure des d’una atura de 20 metres, mentre que, al mateix
temps, es llança des de baix un altre cos. Calcula:
a) A quina velocitat cal llaçar-lo per a que es troben els dos cossos a una
altura de 10 m.
b) Quin temps tarda en arribar al terra el primer cos que es deixa caure? A
quina velocitat arriba al terra?

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examen cinemática.doc

  • 1. FÍSICA I QUÍMICA 4t ESO. EXAMEN CINEMÀTICA. Nom:_____________________________________________________ Nota:_________ 1. Un cos es mou segons aquesta equació de posició r=2t i + (3t2-1)j+(t - 2)k m. Calcula: a) El vector desplaçament i la distància recorreguda en els cinc primers segons i durant el primer minut de començar el moviment. b) La velocitat mitja i el seu valor en els cinc primers segons d) L’acceleració mitja i el seu valor en els cinc primers segons. 2. Un cotxe ix de Xàtiva cap a Ontinyent a 90 km/h i un altre ix d’Ontinyent cap a Xàtiva a 20 m/s, si la distància que hi ha entre ells és de 30 km, calcula la distància a la que es troben i l’instant al que es troben els dos cotxes. Quina distància recorre cada cotxe? Dibuixa els gràfics corresponents. 3. El conductor d’un camió que circula a 90 km/h observa un gos que creua inesperadament la calçada. Frena i tarda 4 segons per parar. Si el gos es troba a 60 m, l’atropellarà? Si tenim en compte ara el temps de reacció del conductor que és de 1 segon en les mateixes condicions, atropellarà al gos? 4. Un cos es deixa caure des d’una atura de 20 metres, mentre que, al mateix temps, es llança des de baix un altre cos. Calcula: a) A quina velocitat cal llaçar-lo per a que es troben els dos cossos a una altura de 10 m. b) Quin temps tarda en arribar al terra el primer cos que es deixa caure? A quina velocitat arriba al terra?