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# A flying machine offering the least frictional force should be?

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Solution

## Explanation:The frictional force is the force resisting the relative motion of solid surfaces, fluid layers, and substances that slide against each other.It is directly proportional to the surface area which is an area of contact in terms of frictional force.In a streamlined body, the curves and its shape are in such a way that area of contact is the leastWe can illustrate this through a diagram. From the figure, it is clear that frictional force is the least on streamlined bodies. The object is easily able to overcome the friction or drag force and move.Here, drag force is the frictional force applied by the fluid on the object.Therefore we can conclude that the frictional force is the least on streamlined bodies and thus a flying machine offering the least frictional force should be a streamlined body.

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