Question

it is difficult to open an inkpot with greasy or oily hands. explain

Answer 1

When the hands are oily, then the oil acts as lubricant and reduces the friction.As the frictional force is less, it is difficult to get grip over the lid of the bottle and becomes difficult to open it.

Answer 2

this is bcoz smooth or oily surface offer less friction and we are not able to control Friction with oily hands