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The forces are vectors, meaning, they have a direction and an intensity. When multiple forces "attack" and object and the result force is not a zero, that means there is a resultant single force that affect the object. That single force has a direction and intensity. As a result of this, the object will start moving along the direction of the resultant force, accelerating with an acceleration that can be calculated as:

a = F/m


where:

"a" is the acceleration in m/s2

"F" is the intensity of the force

"m" is the mass of the object.


Now, if in the system of reference (read: from the observer's point of view) the object was moving linearly and with a constant speed, or it was not moving at all, the final direction of the movement can be calculated as a superimposition of the vectors of the initial movement and the changing vector of the accelerated movement caused by the resultant force mentioned above.

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