# Work of friction on rolling objects

In many cases when there is friction acting on a body which is rolling without slipping ( for eg : a body rolling down a inclined plane ),

We say, that the work done by the friction is zero as the velocity of point in contact is zero adn it works out.

But the question,I am having is how does friction still comes into play while the relative velocity of the point is zero ? , because as we know when relative velocity is zero , friction shouldn't act. But if the later is only true after friction comes into play then why does it still keep acting after the relative velocity is zero?

• Why did you rollback my edit just to make the same edit yourself? Commented Jun 18, 2020 at 15:21
• Actually, I am new here and I thought U suggested those edits. So, I did it. Anyway, I don't think it should make any difference afteralll and thanks for the answer btw. Commented Jun 21, 2020 at 5:44
• No worries. Please up vote all useful answers and make sure to select one answer as the accepted answer if it sufficiently answers your question. Commented Jun 21, 2020 at 11:42

This is false. Static friction acts when the relative velocity between surfaces is $$0$$. For a simple example, take a heavy object and start pushing on it without it moving. Static friction is the force that opposes your applied force before the object starts moving.