Strength of Materials
Dynamic friction as compared to static friction is

may be less of more depending on nature of surfaces and velocity
same
more
less

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Strength of Materials
Kinetic friction is the

The friction force acting when the body is just about to move
The friction force acting when the body is in motion
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction

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