Ncert Exercises & Solutions

In the figure, what will be the sign of the velocity of the point $P'$ , which is the projection of the velocity of the reference particle P. P is moving in a circle of radius R in the anti-clockwise direction.

Hint: The direction of velocity depends on the motion of the particle.

Step 1: Find the direction of velocity.

As the particle on the reference circle moves in the anti-clockwise direction. The projection will move from P' to O towards left.

Hence, in the position shown, the velocity is direction from P'

\to

P'' i.e., from right to left, hence sign is negative.

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