Question

a book is placed on a table is at rest.is the force of friction acting on or it why?

Answer 1

Answer:

When a book is place on a table that is at rest, the force of friction is acting on it. If there was no frictional force it is possible that the book will slide here and there. Friction is the opposite force that acts on a body. Overall, frictional force helps in maintaining equilibrium on the world.

Explanation:

Hope it helps you dear friend

Answer 2

Answer:

We know there's two forces acting on a book while it sits on a table:the force of gravity pulling it down, and the normal force of the table acting upward on the book

The book isn't accelerating while it sits there. That's because the weight of the book is being counteracted by the normal force of the table.