Net force is the overall force acting on an object, taking into account both the magnitude and direction of all individual forces acting on the object.
Net force is calculated by adding all the individual forces acting on an object, taking into account their direction. If the net force is zero, the object will remain at rest or continue moving at a constant velocity. If the net force is not zero, the object will accelerate in the direction of the net force.
In a closed system, such as a metal box with air at a constant temperature, the air pressure and net force are directly related. An increase in air pressure will result in a greater net force on the sides of the box, while a decrease in air pressure will result in a smaller net force.
Temperature has a direct effect on the air pressure inside the metal box, which in turn affects the net force on the sides of the box. As temperature increases, the air molecules have more energy and collide more frequently, resulting in a higher air pressure and therefore a greater net force on the sides of the box.
Net force is typically measured in units of Newtons (N) in the metric system or pounds (lbs) in the imperial system. It can also be measured in units of kilogram-force (kgf) or pound-force (lbf).