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Gravity is the force on Earth that keeps objects down and grounded. Gravity in elementary physics is also the force that gives free-falling objects a universal acceleration of 9.8m.s^2.
In movie F6, objects of varying masses were dropped from a ladder at the same height at the same time. Prior knowledge has us believe objects of greater mass experience greater amounts of gravity, which could cause a greater falling velocity.  However, both objects hit the floor at the same time. This is due to this bigger velocity that has greater drag force.

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Proposed net force formula for this situation

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Calculating the net force of an object is very situational, therefore there isn't a universal formula to solve for this value.
My proposed formula is to add the total newtons for a certain direction, then add the total newtons for the opposing direction. Subtract the values from each other and the larger number from a certain direction determines the net force of that object.

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Two gentlemen lifting a couch with force arrows

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Net Force is the sum of all the forces acting on a single object.

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Two gentleman kicking the same soccer ball in opposing directions

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In the previous unit, we learned the effects of a singular force acting on a stationary, or moving object.
Combined forces deals with deciphering the effects of multiple forces on a single object and how that affects its movement.