Consider the normal force on a book at rest on a tabletop. If the table is tilted so that the surface forms an inclined plane, will the magnitude of the normal force change? If so, how?
Solution Step 1 of 4 Normal force is the contact force , which exists between the contact surfaces. It acts perpendicular to the contact surface. (due to action reaction pair). Weight is due to the gravitational of the earth, which is exerted on the object with mass m on the earth surface. It acts always towards the earth. That is W= mg Where m is the mass of the object and g is acceleration due to gravity. Step 2 of 4 When the book is placed on the table, there will be two forces acting on the book. One being weight due to gravity of the earth ; which will be acting downward. Other one is the normal force, which is due to the contact of book with the surface of the table; which is acting perpendicular to the surface, that is upward. This normal force which is acting upward, keeps the book at rest on the table. Because the normal force is equal in magnitude to the weight and opposite in direction. As shown below The normal force on the book when table is horizontal, N= mg