First slide

Vectors

Question

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

Moderate

A

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

increase
C

decrease
D

remain constant

Solution

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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