(C) The air resistance experienced by a falling body depends on its shape. $A$ streamlined body (like the cigar-shaped object) experiences the minimum

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(C) The air resistance experienced by a falling body depends on its shape. $A$ streamlined body (like the cigar-shaped object) experiences the minimum air resistance because it allows the air to flow smoothly around it,minimizing turbulence and pressure drag.Conversely,a flat object (like the disc) experiences the maximum air resistance because it creates a large wake and significant pressure difference across its surface.Therefore,the order of air resistance is: $R_3$ (cigar-shaped) $Thus,the correct relation is $R_3 < R_2 < R_1$.

Class 11 Physics Mechanical Properties of Fluids Viscosity and Stoke's Law and Terminal Velocity

Medium

When a body falls in air,the resistance of air depends to a great extent on the shape of the body. $3$ different shapes are given in the figure: $(1)$ Disc,$(2)$ Ball,and $(3)$ Cigar-shaped. Identify the combination of air resistances $(R_1, R_2, R_3)$ which truly represents the physical situation. (The cross-sectional areas are the same).

A
$R_1 < R_2 < R_3$
B
$R_2 < R_3 < R_1$
C
$R_3 < R_2 < R_1$
D
$R_3 < R_1 < R_2$

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Mechanical Properties of Fluids

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Viscosity and Stoke's Law and Terminal Velocity

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