When a body moves through a fluid, it experiences an opposing force that tries to oppose its motion through the fluid. Is it true that this opposing force is known as a drag force?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
Friction is the force that resists the movement of two surfaces of an object when they come into contact. For example, when a body moves through a fluid, it experiences an opposing force called drag force that works to prevent the body's motion through the fluid. Drag directly depends on the mass of the flow going past the aircraft, and it also depends on two other properties of the air: its viscosity and compressibility. These factors affect the wave drag and skin friction which are described above.
An excellent example of drag being a reasonable force is during skydiving: skydivers rely on the drag to low down the speed of their falls so that a safe landing can take place — hence, the reason for parachutes. Like any other object that moves through the air, aeroplanes also experience drag.

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