Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

When a body of mass $m$ just begins to slide as shown, match List-I with List-II:

List-I (a) Normal reaction (b) Frictional force ( $f_s$ ) (c) Weight ( $mg$ ) (d) $mg \sin \theta$

List-II (i) $P$ (ii) $Q$ (iii) $R$ (iv) $S$

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

Analyze the Physical Situation: A body is on an inclined plane and just begins to slide down. This is a case of limiting friction.
Identify Forces:

Weight ( $mg$ ): Acts vertically downwards towards the center of the earth. In standard diagrams, this vector is often labeled pointing straight down (Label $R$ ).
Normal Reaction ( $N$ ): Acts perpendicular to the contact surface, directed away from the plane. (Label $S$ ).
Frictional Force ( $f_s$ ): Opposes the tendency of motion. Since the body tends to slide down, friction acts up the inclined plane. (Label $Q$ ).
Component $mg \sin \theta$ : This is the component of weight acting parallel to the inclined plane, pulling the body down. (Label $P$ ).

Select Option: The matching sequence is (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i), which corresponds to Option 2. (Reference: NCERT Class 11, Physics Part I, Chapter 5: Laws of Motion, Section 5.9 and Figure 5.11/4.11 depict the free-body diagram of a mass on an incline).

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