Suppose outer surface of the tumbler is greasy , or has a thin layer of cooking oil on it; would it become easier or more difficult to hold? Just think : would it be possible to hold the glass at all if there is no friction? if no , so give reason.
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If the outer surface of a glass tumbler is oily all greasy then it becomes more difficult to hold it. This is because the presence of a film of oil on the outer surface of glass tumbler reduces the friction between glass tumbler and our hands
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