There are in total 4 forces acting on the object. Let's call m the mass of the object and g the gravitational acceleration. We have:
1) The force that is pushing the book, making it sliding along the table. This force acts horizontally, in the same direction of the displacement.
2) The frictional force between the textbook and the table, acting horizontally in the opposite direction of the displacement. This force is equal to
where
is the coefficient of friction.
3) The weight of the object, acting vertically and downwards, equal to
4) The reaction force of the table against the textbook, acting vertically and upwards, equal to the weight of the object.
1) The force that is pushing the book, making it sliding along the table. This force acts horizontally, in the same direction of the displacement.
2) The frictional force between the textbook and the table, acting horizontally in the opposite direction of the displacement. This force is equal to
where
3) The weight of the object, acting vertically and downwards, equal to
4) The reaction force of the table against the textbook, acting vertically and upwards, equal to the weight of the object.