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This tag is for non-relativistic material strings, such as, e.g., a guitar string. PLEASE DO NOT USE THIS TAG for relativistic strings and string theory.

1 vote
2 answers
486 views

Tension in a massless string as it bends around a concave shape

I understand that tension in a massless string must be the same throughout when the string is straight, to prevent any section of it from accelerating at an infinite rate. … Again as we do not want the section of the string wrapped around a peg to accelerate at an infinite rate, the reaction force of the peg on the string must balance the sum of the tensions on each side. …
Si Chen's user avatar
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Accepted

Reaction Force on String Wrapped Around Circular Peg

Consider the net torque on the segment of string wrapped around the peg about the peg's centre. … The reaction force the peg exerts on the string at each point is radial, and so does not contribute to this net torque. …
Si Chen's user avatar
  • 425
2 votes
2 answers
3k views

Rod Falling on Frictionless Surface

A rigid rod with mass $m$ is initially held at an angle with respect to a frictionless plane by a string. Then the string is cut. What happens to the rod? …
Si Chen's user avatar
  • 425
0 votes
3 answers
2k views

Reaction Force on String Wrapped Around Circular Peg

A massless inextensible string is wrapped around a frictionless circular peg. The string is taut, with tension $T_2$ and $T_1$ at the points where it leaves of the pg as shown. … The section of string wrapped around the peg is in mechanical equilibrium. …
Si Chen's user avatar
  • 425