What is at the origin of the force drag in water? A. The difference of the water flow speed above an object and right below it. B. The difference in hydrostatic pressure above an object and right below it. C. The friction caused by the water flows moving against an object’s irregularities. D. The reaction to the action of the Earth’s gravity on the object. E. None of the above is true.
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.
What is at the origin of the force drag in water?
A. The difference of the water flow speed above an object and right below it.
B. The difference in hydrostatic pressure above an object and right below it.
C. The friction caused by the water flows moving against an object’s irregularities.
D. The reaction to the action of the Earth’s gravity on the object.
E. None of the above is true.
For an object that is moving through water, the drag force acts in a direction which is opposite to the relative flow velocity. It depends on the area of cross section of the object (form drag) and the surface roughness of the object (surface or skin drag)
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