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6. system of particles and rotational motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics6. system of particles and rotational motion1 Mark
MCQ
A solid homogenous sphere of mass $M$ and radius $r$ is moving on a rough horizontal surface, partly rolling and partly sliding. During this kind of motion of this sphere
  • A
    total kinetic energy is conserved 
  • B
    angular momentum about the centre of mass is conserved
  • C
    only the rotational kinetic energy about the centre of mass is conserved
  • ✓
    the angular momentum of the sphere about the point of contact with the plane is conserved
✓

Answer

Correct option: D.
the angular momentum of the sphere about the point of contact with the plane is conserved
d
Angular momentum about the point of contact with the surface includes the angular momentum about the centre. Because of friction, linear momentum will not be conserved

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