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Laws of Motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsLaws of Motion1 Mark
MCQ
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.
  • ✓
    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.
✓

Answer

Correct option: B.
The force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero.
Key concept: To solve these types of problem we have to apply Newton’s second law of motion! Newton’s Second Law of Motion
According to this law: The rate of change of linear momentum of a body is directly proportional to the external force applied on the body and this change takes place always in the direction of the force applied.

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