A block is on a rough horizontal surface and a horizontal force F is gradually increased from zero. The coefficients of static and kinetic friction are both 1/√3. Which statements are correct?

Select all that apply

• Option A

  For F below limiting friction, the surface-contact resultant makes an angle less than 30° with the vertical.

• Option B

  At limiting friction the contact resultant makes 30° with the vertical.

• Option C

  After the block starts accelerating, the contact resultant remains at 30° with the vertical.

• Option D

  The angle made by the contact resultant with the vertical depends on the block mass.