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AP EAMCET202018 Sep 2020Morning ShiftPhysicsCenter of Mass, Momentum and CollisionActual

A mass (m ) is in rest on an inclined plane of mass (M ) which is further resting on a smooth horizontal plane. Now, if the mass (m ) starts moving under gravity, the position of centre of mass of system will

Options

  1. Aremain unchanged
  2. Bchange along the horizontal direction
  3. Cmove up in vertical direction
  4. Dmove down in the vertical direction and changes along the horizontal

Correct answer

C. move up in vertical direction

Step-by-step solution

The given situation is shown in the following figure. Clearly when mass (m ) starts moving under gravity, hence net force on the system in horizontal direction is zero. Therefore, centre of mass of the system will not move in horizontal direction. Now, for vertical direction there is a net force that is the mass of the wedge and the block and hence the centre of mass changes in this direction.

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