Question

a girl holding a book on a palm what is a force acting

Answer 1

The force acting on the book will be gravity pulling the book down and the force of your hand holding it up. The net force of the two should be zero as the...
The book will exert gravity and friction. Gravity from the mass of the book, and friction keeps it from sliding off your hand. Your body will exert equal.

Answer 2

A force 'F' is acting on the book that is the earth's gravitational pull or gravity.