A rock of density 2500kg/m^3 with volume 0.002m^3 falls from rest in a viscous medium. The rock is acted on by a net constant downward force of 30N (combination of gravitational and buoyant force Fb) and a viscous retarding force Fd, proportional to it’s velocity, v:Fd= 5v i) Draw a free body diagram showing forces acting on the rock ii) Explain what is meant by ‘viscous medium’ iii) Calculate the mass of the body iv) Calculate initial acceleration of body v) Calculate the terminal velocity of the rock (iii,iv,v)

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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.