Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play. This happens ___.
A
only if the objects are solid
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B
only if one of the two objects is liquid
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C
only if one of the two objects is gaseous
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D
irrespective of whether the objects are solids, liquids or gases
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Solution
The correct option is D irrespective of whether the objects are solids, liquids or gases Force of friction acts in solids, liquids and gases and opposes the motion with respect to each other.