The drag force exerted by a fluid on a body immersed in the fluid is due to
a. pressure and viscous forces
b. pressure and gravity forces
c. pressure and surface tension forces
d. viscous and gravity forces
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On assumption that the body is moving horizontally through the fluid, Option D is correct.
Viscosity of fluid and the gravitational pull, both exert drag force on the body.
The drag force on an immersed object can actually be due to various reasons. It also depends on the direction of the object’s movement. Viscosity is the thickness of fluid which opposes movement of the object. Gravity causes a ‘downward pull’ that slows horizontal movement. Pressure of the liquid, on all sides of the object also hampers its motion.
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