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

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics6. system of particles and rotational motion1 Mark
MCQ
A disc having velocity $v_0$ and angular speed ${\omega _0}$ in anticlockwise direction kept on the rough plank. Initially plank is at rest. (assuming length of plank is very large) Choose $INCORRECT$ option
  • A
    Friction force on the disc is in backward direction till pure rolling start.
  • B
    Friction force between disc and plank is kinetic in nature till pure rolling start.
  • C
    Total momentum of system (disc and plank) is conserved.
  • ✓
    Angular momentum of disc about any point on the horizontal surface remains conserved.
✓

Answer

Correct option: D.
Angular momentum of disc about any point on the horizontal surface remains conserved.
d
Initial velocity of point of contact of disc is in forward direction.Hence friction backward direction and kinetic in nature.Net force on the system is zero. So momentum is conserved.

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