A disc having velocity v_0 and angular speed _0 in anticlockwise … - Vidyadip

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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