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The centre of mass of a rigid body lies-
1. inside the body only
2. outside the body only
3. neither inside nor outside the body
4. either inside or outside the body

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Correct Answer - Option 4 : either inside or outside the body

The correct answer is option 4) i.e. either inside or outside the body

CONCEPT:

  • Center of mass: Center of the mass of a body is the weighted average position of all the parts of the body with respect to mass.
    • The centre of mass is used in representing irregular objects as point masses for ease of calculation.
    • For simple-shaped objects, its centre of mass lies at the centroid.
    • For irregular shapes, the centre of mass is found by the vector addition of the weighted position vectors.


EXPLANATION:

  • The location of the centre of mass depends on two factors - the shape of the body and the distribution of the mass.
  • The centre of mass can lie inside the body when the object is solid.
  • In the case of a circular ring, the centre of mass lies at its geometric centre which is a point outside its body.
  • Since the centre of mass is a point where the whole mass of the system appears to be concentrated, it is not necessary that this point should be inside the body.
  • So, the centre of mass of a body can be either inside or outside the body.

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