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

Glenn Hopkins 2022-07-22 Answered
Define net force, external force, and system. Apply Newton’s second law to determine the weight of an object
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kamphundg4
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