Is it true that drag is generated by the difference in velocity between the solid object and the fluid?

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True

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answer is A.

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Detailed Solution

The above statement is true.
Skin Friction Drag, also known as friction drag, is a drag that is caused due to the friction of fluid on the surface of an object that moves through it. It is proportional to the area in contact with the fluid and escalates with the square of the velocity. If there is no motion between the fluids and the surface in contact, there is no drag. It will not make any sense whether the object moves through a static fluid or whether the fluid moves past a static solid object; this is because every state of matter opposes the motion by friction. The resistance possessed by the layers of fluid is called viscosity.

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