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A system is a defined collection of objects considered for analysis. It separates the objects of interest from the environment to study forces and motion.
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External Force: A force that acts on an object or system from outside its defined boundaries.
Net Force: The vector sum of all external forces acting on a system, determining its acceleration.
Acceleration: $\text{The rate of change of velocity of an object, directly proportional to net force and inversely proportional to mass}$.