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Limiting Friction

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Question

Imagine that an object is falling through a long straight glass tube held vertical, the air has been removed completely from the tube. The object does not touch the walls of the tube. Will the object experience any force of friction? (Yes/No)

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Solution

No, the object will not experience any force of friction because force of friction takes place only when two surface comes in contact. It is given that the object does not touch the walls of the tube thus, there will be no force of friction.

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Imagine that an object is falling through a long straight glass tube held vertical; air has been removed completely from the tube. The object does not touch the walls of the tube. Will the object experience any force of friction?

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Q. An object slides without friction from the height

25 cm

and then goes around the vertical loop of radius

10 cm

from which a symmetrical section of angle

2 α

has been removed. Find the angle

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such that after losing contact at

A

and flying through air, the object will reach point

B

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