Two blocks are stacked, one on top of the other. Both blocks has the same mass, m. and the coefficient of kinetic friction between the ground and the bottom block is the same as that between the top block and the bottom block. A force F pulls the bottom block out from underneath the top block while the top block is tied to the wall.
Which of the following statements about the two friction forces are true?
The friction force between the bottom block and the floor is twice the friction force between the two blocks.
The friction force between the bottom block and the floor is less than twice the friction force between the two blocks
The friction force between the bottom block and the floor is greater than twice the friction force between the two blocks.
The friction force between the bottom block and the floor is equal to the friction force between the two blocks.
There is not enough information given to determine if the above statements are true or false.