Tension is Absent. Since an unrelaxed string is not attached to the block, there is not a tension force on it. Depress mouse to view answer. Normal is Present. Depress mouse to view answer.
Friction is Absent.
Since there aren't any forces trying to slide the block along the table's surface, there is not a friction force. Depress mouse to view answer. Air Resistance is Absent. Since the block is not moving relative to the surrounding air, there is not an air resistance force on it. A block slides across the top of a table.