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  • A metre scale is moving with uniform velocity. This implies (a) the force acting on the scale is zero, but a torque about the centre of mass can act on the scale.

A metre scale is moving with uniform velocity. This implies
(a) the force acting on the scale is zero, but a torque about the centre of mass can act on the scale.
(b) the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero.
(c) the total force acting on it need not be zero but the torque on it is zero.
(d) neither the force nor the torque need to be zero.

Answers (1)

The answer is the option (b) The net force acting on the scale is zero, and the net torque acting about the centre of mass of the scale is also zero.

Explanation: There is no change in velocity as the meter scale is moving with uniform velocity

Therefore, by Newton’s second law, its acceleration will be zero.

\overrightarrow{F } _{net} = m \times 0 = 0

Hence, the net or resultant force acting on the body must be 0.

Now, \overrightarrow{\tau } =\overrightarrow{ r } \times \overrightarrow{ F}

Therefore, toque must be zero as well.

Hence it is obvious that for an object to move with uniform velocity, both net force and torque must be zero.

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infoexpert24

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