The statement that describes the net force on an object is the sum of all forces acting on an object (option A).
Net force is sum of all forces acting on an object in a single plane.
When a force is applied to a body, not only is the applied force acting, there are many other forces like gravitational force, frictional force and the normal force that balances the other force.
The sum of all these forces acting on the object whether in the same or opposite direction is regarded as the net force.
Therefore, the statement that describes the net force on an object is the sum of all forces acting on an object.
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