The discussion revolves around the forces acting on an object moving in a vertical circle, particularly at the point where the normal force (R) is considered to be zero. Participants explore the implications of this assumption and its relation to centripetal force and motion dynamics.
Participants express differing views on the implications of R being zero, with some supporting the idea that circular motion can still occur without contact, while others emphasize the necessity of a non-zero normal force for maintaining contact and circular motion.
The discussion includes assumptions about the nature of forces and motion in a vertical circle, particularly regarding the conditions under which contact is maintained or lost, and the specific speed required for circular motion.
Based on the fact that normal forces are contact forces perpendicular to the tangent of the curve that in this instance must push on the object. If it is less than 0, contact is lost. So it must push with a value greater than 0. Problem is looking for minimums.influx said:
PhanthomJay said:
Yes, gravity only supplies the centripetal force without contact at that point D. The pellet remains at a distance 2 feet from the center of the circle without 'dropping', even though contact is momentarily lost, and with a speed of [itex]\sqrt{rg}[/itex]. It behaves like a satellite in orbit at that specific point, no contact necessary at that point. If the speed was less than that, then continuous circular motion could no be maintained.influx said: