Question

Three forces start acting simultaneously on a particle moving with velocity $\vec{v}$ . These forces are represented in magnitude and direction by the three sides of a triangle ABC(as shown). The particle will now move with velocity

• A. less than $\vec{v}$
• B. greater than $\vec{v}$
• C. $|v|$ in the direction of the largest force $BC$
• D. $\vec{v}$ , remaining unchanged.

Answer 1

Answer: (D)

$\vec{v}$ , remaining unchanged.

Answer 2

According to triangle law of vector addition if three vectors addition if three vectors are represented by three sides of a triangle taken in same order, then their resultant is zero. Therefore resultant of the forces acting on the particle is zero, so the particles velocity remains unchanged.