Problem 2. Fluids at Rest What Force Must a Dam Withstand? Consider the pressure and force acting on the dam retaining a reservoir of water. Suppose the dam is 800 m wide and the water is 120.0 m deep at the dam. (a) What is the average pressure on the dam due to the water? (b) Calculate the force exerted against the dam? Figure 19. Pressure at a Faucet Photo Credit: Giancoli Physics 6th F = pA p hpg The average pressure p due to the weight of the water is the pressure at the average depth h of 60.0 m, since pressure increases linearly with depth. The force exerted on the dam by the water is the average pressure times the area of contact, F = PA.

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Fluid Pressure

The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.

Gauge Pressure

Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.