The formula for calculating normal force is FN = mg, where m is the mass of the object and g is the acceleration due to gravity (9.8 m/s2).
Normal force is equal and opposite to the weight of an object. This means that if an object is resting on a horizontal surface, the normal force acting on it will be equal and opposite to the object's weight, which is given by mg.
The normal force acting on an object on an inclined plane will be less than the object's weight due to the component of the weight acting parallel to the surface. The normal force can be calculated using the formula FN = mg cosθ, where θ is the angle of incline.
Normal force is responsible for creating the frictional force between two surfaces. Without normal force, there would be no friction and objects would not be able to stay stationary or move in a controlled manner.
The normal force can be increased by increasing the mass of the object or by increasing the angle of incline. It can be decreased by decreasing the mass of the object or by decreasing the angle of incline.