A heavy wooden block is dragged by a force along a rough steel plate, as shown below for two cases.The magnitude of the applied force is the same for both cases.The normal force in (ii), as compared with the normal force in (i)is:
A)the same
B)greater
C)less
D)less for some angles of the incline and greater for others
E)less or greater, depending on the magnitude of the applied force

Question

A heavy wooden block is dragged by a force  along a rough steel plate, as shown below for two cases.The magnitude of the applied force  is the same for both cases.The normal force in (ii), as compared with the normal force in (i)is: 
A)the same 
B)greater 
C)less 
D)less for some angles of the incline and greater for others 
E)less or greater, depending on the magnitude of the applied force

Quizplus · Accepted Answer

The normal force is equal to the force perpendicular to the surface. In case (ii), the surface is inclined at a greater angle, which means that the force perpendicular to the surface is less, resulting in a smaller normal force. Therefore, the normal force in case (ii) is less than in case (i).

A Heavy Wooden Block Is Dragged by a Force