Physics
It is difficult to open an inkpot with greasy or oily hands. Explain.
Force
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Answer
It is difficult to open an inkpot with greasy or oily hands because the friction between our fingers and the inkpot lid becomes very low. Friction is necessary to get a good grip and apply the force needed to turn and open the lid. When our hands are oily, the surfaces become slippery, reducing friction significantly. As a result, we cannot hold the lid firmly or apply enough force effectively, which makes it hard to open the inkpot.
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