A brick initially has its largest-area face in contact with a rough surface,as shown on the left in the figure.A force F is required to pull the brick along the surface at constant speed. The brick is now flipped so that a face of smaller area is in contact,as on the right in the figure.The material of the brick is uniform on all faces.What force is now required to pull the brick along at constant speed as before?
A)a smaller force
B)the same force
C)a greater force
D)One cannot say without knowing the coefficient of friction.

Question

A brick initially has its largest-area face in contact with a rough surface,as shown on the left in the figure.A force F is required to pull the brick along the surface at constant speed.  The brick is now flipped so that a face of smaller area is in contact,as on the right in the figure.The material of the brick is uniform on all faces.What force is now required to pull the brick along at constant speed as before?
A)a smaller force 
B)the same force 
C)a greater force 
D)One cannot say without knowing the coefficient of friction.

Quizplus · Accepted Answer

The Answer of A brick initially has its largest-area face in contact with a rough surface,as shown on the left in the figure.A force F is required to pull the brick along the surface at constant speed.  The brick is now flipped so that a face of smaller area is in contact,as on the right in the figure.The material of the brick is uniform on all faces.What force is now required to pull the brick along at constant speed as before?
A)a smaller force 
B)the same force 
C)a greater force 
D)One cannot say without knowing the coefficient of friction.

A Brick Initially Has Its Largest-Area Face in Contact with a Rough