The force exerted by a static fluid on a surface either plane or curved, when the fluid comes in the contact with surface is called:

Concept:

Hydrostatic Forces:

• Fluid statics or hydrostatics is the branch of fluid mechanics in which stresses generated in a fluid system are determined when it is at rest or static condition.
• The force exerted by a static fluid on a surface either plane or curved, when the fluid comes in the contact with the surface is called Total pressure.
• The point of application of total hydrostatic force on the surface is known as the center of pressure.

Total Hydrostatic Force on a Horizontal Plane and inclined surface:

Consider a plane surface immersed in a static mass of liquid of specific weight γ, such that it is held in a horizontal position at a depth h below the free surface of the liquid and if the surface is in a vertical position such that the centroid of the surface is at depth of h̅ below the free surface. A is the area of the total surface, then the total hydrostatic force on the horizontal surface,

F = γAh̅ 

γh̅ is the pressure intensity at the centroid of the surface. Therefore, it can be stated that the total hydrostatic force on a plane surface is equal to the product of the surface area and the intensity of pressure at the centroid of the area.