Can a particle traveling along a straight path have an angular acceleration? Exp

Question

Can a particle traveling along a straight path have an angular acceleration? Explain. Is the angular momentum of an object always parallel to its moment of inertia? Explain. If there is no net force acting on an object, is its angular momentum conserved? Explain. Is the time rate of change of angular momentum of an object about a given axis equal to the not torque acting on that object about that axix? Explain. Thanks for help. I will give big time kudos to anyone who really explains these points clearly.

Explanation / Answer

angular acceleration is d2/dr2

as =0 is for linear path angular acceleration=0

angular momentum=r*mv

and I is perpendicular to direction of rotation so they can be parallel only when r is perpendicular to v

by definition of net torque

time rate of change of angular momentum of an object about a given axis equal to the net torque acting on that object about that axis

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