Applied Mechanics and Graphic Statics
When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are

Circle and parabola
Straight line and parabola
Straight line and circle
Circle and straight line

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

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

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