For example, if you push a car with a force of 100 Newtons and your friend pushes the car with a force of 50 Newtons, the net force on the car is 150 Newtons. This means that the car will accelerate in the direction that you and your friend are pushing it.
The same principle applies to any object, regardless of its mass. If two forces act in the same direction on an object, the object will accelerate in the direction of the forces.