Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

A particle moving with velocity $\vec{v}$ is acted by three forces shown by the vector triangle $PQR$ . The velocity of the particle will:

change according to the smallest force $\vec{QR}$

increase

decrease

remain constant

Equilibrium Condition: The problem states that the three forces acting on the particle are represented by the sides of a vector triangle $PQR$ . According to the triangle law of vector addition, if three vectors represented by the sides of a triangle are taken in the same order, their resultant (vector sum) is zero [NCERT Class 11, Physics Part I, Chapter 4, Section 4.8].
Net Force: Consequently, the net external force acting on the particle is zero ( $\vec{F}_{net} = 0$ ).
Newton's First Law: According to Newton's First Law of Motion, if the net external force on a body is zero, its acceleration is zero, and it continues to move with a constant velocity [NCERT Class 11, Physics Part I, Chapter 4, Section 4.5]. Therefore, the velocity of the particle remains constant.

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