Conceptual question over pendulum

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SUMMARY

The discussion centers on the dynamics of a pendulum with length L and bob mass M, specifically regarding the maximum kinetic energy achieved at the lowest point of its swing. It is established that the maximum kinetic energy occurs when the pendulum reaches the bottom position, where gravitational potential energy is fully converted into kinetic energy. A key point clarified is that at this lowest point, the tension in the string exceeds the gravitational force (mg), contradicting the initial assumption that they are equal.

PREREQUISITES
  • Understanding of pendulum mechanics
  • Basic principles of gravitational potential energy
  • Knowledge of kinetic energy concepts
  • Familiarity with forces acting on objects in motion
NEXT STEPS
  • Study the equations of motion for pendulums
  • Explore the conservation of energy in mechanical systems
  • Learn about the forces acting on pendulums at various points in their swing
  • Investigate the effects of varying mass and length on pendulum dynamics
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Physics students, educators, and anyone interested in understanding the mechanics of pendulums and energy conservation principles.

jperez94
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Hey guys, just a quick question. If you have a pendulum of length L and a bob of mass M, and if you bring the string to a horizontal position and then give the bob a minimal initial speed enabling the pendulum to make a full turn... the maximum kinetic energy of the pendulum will be when it reaches the bottom... at mg=tension...right?
 
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Yes, since the pendulum had gravitational potential energy relative to its position before, all of the gravitational energy plus that little kinetic energy given will be converted fully to kinetic energy when the gravitational potential is zero which is at the bottome as you say it
 
Originally posted by jperez94
... when it reaches the bottom... at mg=tension...right?
Just a comment: at the bottom, the tension in the string will not equal mg; it will be greater than mg.
 

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