Miscarea mecanica
Quiz
•
Physics
•
9th Grade
•
Hard

Petru-Doru Balan
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10 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 1 pt
Care dintre următoarele enunțuri nu sunt adevărate pentru mișcarea rectilinie uniform variată:
traiectoria este rectilinie
viteza mobilului poate crește
viteza mobilului se modifică
accelerația mobilului este nulă
2.
MULTIPLE SELECT QUESTION
3 mins • 1 pt
Viteza de 60km/h este egală cu:
15m/s
10km/min
1km/min
16 m/s
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Un automobil se deplaseaza pe o traiectorie rectilinie cu viteza de 72 km/h. Automobilul franeaza timp de 20 s si viteza lui scade la 18 km/h.
Acceleratia mobilului pe durata franarii are valoarea
-0.75 m/s
0.75 m/s
-0.75 m / s2
0.75 m/s2
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Un biciclist parcurge 20% din distanță cu viteza de 8km/h și restul cu viteza de 16km/h. Dacă distanța totală parcursă este de 40km, viteza medie a biciclistului este:
12km/h
13,33km/h
12,5 km/h
10,33km/h
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Un tren merge cu viteza de 15 m/s, iar o motocicleta merge cu viteza de 54 km/h.
Care dintre cele doua mobile merge mai repede?
merg cu aceeasi viteza
trenul
motocicleta
motocicleta, ca e mai usoara, pe cand trenul e mai greu
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Legea mișcării unui mobil este: x=20+4t-2t2. Viteza inițială și accelerația mobilului sunt:
4m/s; -2m/s2
2m/s; 4m/s2
4m/s; -4m/s2
20m/s; -4m/s2
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Un tren își mărește viteza de la 20m/s la 25m/s în 25s. Accelerația trenului și distanța parcursă în acest timp sunt:
0,2m/s2 ; 562,5 m
0,5m/s2 ; 562,5 m
5m/s2 ; 56,25 m
-0,2m/s2 ; 562,5 m
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