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  4. Assertion: A particle is moving on a straight line with a uniform velocity, its angular momentum is always zero. Reason: The momentum is zero when particle moves with a uniform velocity

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Q. Assertion : A particle is moving on a straight line with a uniform velocity, its angular momentum is always zero.
Reason : The momentum is zero when particle moves with a uniform velocity

System of Particles and Rotational Motion

Solution:

When particle moves with constant velocity $\vec{v}$ then its linear momentum has some finite value $(\vec{P}=m \vec{v})$. Angular momentum $(L)=$ Linear momentum $(P) \times$ Perpendicular distance of line of action of linear momentum form the point of rotation $(d)$ So if $d \neq 0$ then $L \neq 0$, but if $d =0$ then $L$ may be zero. So we can conclude that angular momentum of a particle moving with constant velocity is not always zero.