No. There is no such thing as a single force that is balanced or unbalanced, and a desk is not a force anyway.
The force of your pencil or pen against the desk that your paper is on if you're writing something down. The force of your paper against the desk. The force of your book against the desk. In each case, the desk exerts the identical but opposite force against the object lying on it. If that were not true, the objects would deform the desk, or the desk would form a bump where the objects are lying on it.
10
Gravity
If the combined force is enough to overcome the force of friction, the desk will start moving.
No. There is no such thing as a single force that is balanced or unbalanced, and a desk is not a force anyway.
The force of your pencil or pen against the desk that your paper is on if you're writing something down. The force of your paper against the desk. The force of your book against the desk. In each case, the desk exerts the identical but opposite force against the object lying on it. If that were not true, the objects would deform the desk, or the desk would form a bump where the objects are lying on it.
10
Gravity
Gravity.
Gravity
If the combined force is enough to overcome the force of friction, the desk will start moving.
That would be the force of gravity.
Friction.
The gravitational force between you and your desk is way too weak to notice. Insert your own mass (for example, 50 kg), the mass of the desk (shouldn't be more than 50 kg or so), and an estimate for the distance (for example, 1 meter) into the formula to calculate the force of gravity. You'll see that the result is an extremely weak force.
5N.
Work = Force X Distance 20 N X 10 m = 200 N-m