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Question
In which of the following options is frictional force working?
In which of the following options is frictional force working?
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Solution
The correct options are
A A boulder rolling down a mountain
B Airplane flying
C A swimmer in river
Friction is present whenever there is contact between two solid surfaces or a solid surface and a fluid. In the first three options, some friction is experienced as there is some contact in all the cases. But, the moon orbits in space where there is a vacuum. Hence, no frictional force is involved in this case.
A
A boulder rolling down a mountain
B
Airplane flying
C
A swimmer in river
Friction is present whenever there is contact between two solid surfaces or a solid surface and a fluid. In the first three options, some friction is experienced as there is some contact in all the cases. But, the moon orbits in space where there is a vacuum. Hence, no frictional force is involved in this case.
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