Before the Mover Mat
The net force is 0. The "fridge" is not accelerating because the forces are balanced.
About the Modifications Made
We used felt to decrease the friction between the fridge and the floor. The modification was successful, because the fridge is now easier to slide across the floor without damage and requires less force to make it move. We also placed cardboard in between the felt pieces. The cardboard holds up the weight of the fridge that is being caused by gravity and increases the stability of the Mover Mat.
After the Mover Mat
The net force is 0. The "fridge" is not accelerating because the forces are balanced.
The net force is 3.6 N to the right. The "fridge" is accelerating because the forces are unbalanced.