A particle moving with velocity is acted by three forces shown by the vector triangle PQR. The velocity of the particle will [2019]

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Solution

Q.
A particle moving with velocity $\vec{v}$ is acted by three forces shown by the vector triangle PQR. The velocity of the particle will [2019]

1 change according to the smallest force $\vec{Q R}$

2 increase

3 decrease

4 remain constant

Ans.
(4)

As per triangle law, ${\vec{F}}_{1} + {\vec{F}}_{2} + {\vec{F}}_{3} = 0$ i.e., net force on the particle is zero. So, acceleration is also zero.

Hence velocity of the particle will remain constant.

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