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Question
An object falls through a long straight vertical glass tube without touching its walls. Will the object experience any force of friction if the air was completely removed from the tube?
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Solution
No, the object will not experience any frictional force because to experience the force of friction, two surfaces must be in contact.
In this case, its already mentioned that the object didn't touch the walls of the tube, and there's no possibility of air drag since there was no air in the tube.
In this case, its already mentioned that the object didn't touch the walls of the tube, and there's no possibility of air drag since there was no air in the tube.
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