Is it possible to open a pen cap with one finer? why ?

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Solution

To open a cap with finger, enough frictional force ( for good contact ) must be produce to give it a specified torque.
Generally, we can't open a cap with only 1 finger but 2 fingers can do easily.
Hence, solved.

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Is it possible to open a pen cap with one finer? why ?

To open a cap with finger, enough frictional force ( for good contact ) must be produce to give it a specified torque.Generally, we can't open a cap with only 1 finger but 2 fingers can do easily.Hence, solved.

To open a cap with finger, enough frictional force ( for good contact ) must be produce to give it a specified torque.
Generally, we can't open a cap with only 1 finger but 2 fingers can do easily.
Hence, solved.