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A particle moves on a straight line with...

A particle moves on a straight line with a uniform velocity. The angular momentum of the particles is

A

Always zero

B

zero about a point on the stright line

C

zero about a point away from the straight line

D

constant always about a given point not on the line

Text Solution

Verified by Experts

The correct Answer is:
B, D
As `L = mv r`, therefore `L = 0`, when `r = 0` i.e. when point lies on the straight line. When a given point does not lie on the line, `r =` consatnt.
Therefore, `L = mv r =` consatnt.
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Knowledge Check

  • The angular momentum of a particle is

    A
    parallel to its linear momentum
    B
    perpendicular to its linear momentum
    C
    inclined to its linear momentum
    D
    a scalar quantity

  • A body moves on a straight line with a uniform velocity Its angular momentum

    A
    is zero about a point on the straight line.
    B
    remains constant about any given point.
    C
    is always zero.
    D
    is not zero about a point away from the straight line.

  • For a particle moving in a straight line

    A
    If velocity is negative and acceleration is positive then speed increases.
    B
    if velocity is positive and acceleration is negative then speed decreases.
    C
    if velocity is zero at an instant then acceleration must also be zero at that instant.
    D
    it is possible that speed of a particle is never zero in an interval of time, but average speed is zero.

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