In the figure, horizontal force F is applied to the block.



What is the size of the normal force acting on the block?

  1. FN=mg·cosθ
  2. FN=mg
  3. FN=mg·cosθ+F·cosθ
  4. FN=mg·cosθ-F·cosθ
  5. FN=mg·cosθ+F·sinθ