There is Inertia with newtons law that an object in motion stays in motion. There is gravity holding it down.If the object is at rest, there is no force acting upon it. Force = mass x acceleration...
Yes. As long as the net force is zero, the object will not accelerate in any direction and will stay at its current state of motion, which can be at rest if desired.
An object with no force on it will either be at rest or moving with a steady velocity, an object with an unbalanced force, which is the same as saying it has a net force on it, will be accelerating...