Question

If you try to hold a glass with soapy hands it slips. Why?

Answer 1

It slips from our hand because when we apply soap in our hand it decreases the frictional force thus resulting very low frictional force between our hands and glass tumbler .

Answer 2

We need proper friction to grab or hold anything. Likewise holding glass also requires a fiction for a proper grip. But, soapiness act like a lubricant which decreases the friction between hand and glass. So, little friction result in a week grip, hence when a person tries to hold a glass with the soapy hand it slips.