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NEETPhysicsRotational Motion

A particle is moving uniformly along a straight line as shown in the figure. During the motion of the particle from A to B, the angular momentum of the particle about 'O'

Options

  1. Aremains constant
  2. Bincreases
  3. Cfirst increases then decreases
  4. Ddecreases

Correct answer

A. remains constant

Step-by-step solution

Angular momentum L=mvr where r is the perpendicular distance between velocity and reference point Here since the line AB is straight, there would only 1 perpendicular distance from reference point i.e OA So, Angular momentum at A =mvr Angular momentum at P =mvr Angular momentum at B =mvr Since, perpendicular distance between the line AB and O will always be R So all the points lying on the line AB will have same angular momentum equals to mvr.

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