Question

a book is lying on the table. wha is the angle between the action of the book on the table and the reaction of the table on the book

Answer 1

Action Force and Reaction Force are in opposite directions.
So,
$the \: angle \: between \: them \: is \: {180}^{o}$

Answer 2

Angle between the action and reaction forces is 180°.

•Book acts at 90°.

•The direction of action is vertically downwards.

•The action of book is on the table.

•Table reacts at 90°.

•The direction of action is vertically upwards.

•The reaction of table is on the book.

•The angles are hence, 90° + 90°.

•Therefore, total angle between the two forces is 180°.

•Since the direction of force is opposite to each other, hence no resultant action occurs.