4. You are rearranging your room and are now sliding your desk across the floor at constant velocity. Which of the following statements about the forces acting on the desk is correct? [Consider only horizontal forces]

• The force that you’re exerting on the desk must be equal in amount but opposite in direction to the force that the floor is exerting on it.
• The amount of force that you’re exerting on the desk must be more than the amount of force that friction is exerting on it.
• The amount of force that you’re exerting on the desk must be equal to the amount of its weight.
• The amount of force that you’re exerting on the desk must be more than the amount of its weight.