# Is a string taut if the tension is zero?

I'm studying vertical circles and a particle on a string will remain in motion as long as the string is taut. However, what if there is 0 tension in the string? Is it still technically taut?

• What are "vertical circles"? Could you please clarify the motion you are considering. (For example, by supplying a sketch of the considered system). – Sebastian Riese May 31 '15 at 19:15
• The tension in a vertical string (hyperphysics.phy-astr.gsu.edu/hbase/mechanics/cirvert.html) depends on the part of the string in question. The link above says the tension at the top is equal to the tension at the bottom plus $6mg$. – Harry Wilson May 31 '15 at 19:28