Answer this MCQ...?
In which example does friction act in the direction of forward motion of the object on which it acts?
A on a suitcase accelerating on a conveyor belt
B on sandpaper rubbing a wooden block
C on the skies of a skier accelerating downhill on smooth snow
D on the tyres of a braking car
In which example does friction act in the direction of forward motion of the object on which it acts?
A on a suitcase accelerating on a conveyor belt
B on sandpaper rubbing a wooden block
C on the skies of a skier accelerating downhill on smooth snow
D on the tyres of a braking car
2 Answers
Jun 26, 2017
A. On conveyor belt a suitcase is in forward direction with some friction.
Jun 29, 2017
Letter D
Explanation:
From Cambridge Examinations:
D. on the tyres of a braking car.
Friction lines here follow the same direction of the rolling object (tyre). Friction on rolling objects is quite different.
