# Define net force, external force, and system. Apply Newton’s second law to determine the weight of an object

Define net force, external force, and system. Apply Newton’s second law to determine the weight of an object
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Net force can be defined as the vector sum of the forces acting on a particular object.
Net external force can be defined as the vector sum of all the external forces acting on a particular object.
A system can be defined by the boundaries of an object or collection of objects being observed. Any force that originates from outside a system is considered external forces.
According to the Newton’s second law of motion, the net force acting on an object is directly proportional to the acceleration of the object.
${F}_{\text{net}}=ma$
Consider a ball of mass 10kg under free fall. Then the weight of the ball can be obtained as