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A force is a push or pull exerted on an object that can cause it to accelerate or change direction.
The net force on an object is calculated by summing all the individual forces acting on the object, taking into account their direction and magnitude.
Balanced forces are forces that cancel each other out and do not cause a change in an object's motion. Unbalanced forces, on the other hand, do not cancel out and result in a change in an object's motion.
The most common unit of force is the Newton (N), which is equivalent to 1 kg*m/s^2. Other units of force include pounds (lb) and dynes (dyn).
To solve forces for a system of linked objects, you must first identify all the individual forces acting on each object, including external forces and internal forces between the objects. Then, you can use Newton's laws of motion and equations of motion to calculate the net force on each object and determine their resulting motion.