No, more than one force can act on an object at a time. When multiple forces are applied to an object, they can either cancel each other out, add together, or result in the object's movement in a particular direction, determined by the net force acting on the object.
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If there is only one force acting on an object, the object will accelerate in the direction of that force according to Newton's second law of motion (F=ma). The acceleration will depend on the magnitude and direction of the force and the mass of the object.
When multiple vectors act on an object, each vector exerts its own force on the object independently of the others. The resultant force is the vector sum of all the individual forces acting on the object.
When only one force is acting on an object, the object will accelerate in the direction of that force following Newton's second law (F=ma). The object will either speed up, slow down, or change direction depending on the direction and magnitude of the force.
Action-reaction forces always act on two different objects. When one object exerts a force on a second object, the second object exerts an equal and opposite force back on the first object.
Mechanical Equilibrium is the state in which 2 or More forces act on an object , and cancel each other out. There has to be an even number of forces for them to cancel each other out. So no, a single force will not achieve mechanical equilibrium.