Pendulum and Oscillating Motion

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SUMMARY

The discussion centers on calculating the tension in the string of a pendulum with a length of 0.8 m and a bob mass of 1.0 kg, which has a speed of 1.8 m/s at the bottom of its swing. The forces acting on the bob include tension and gravitational force, which together constitute the net force. The key to solving this problem lies in applying Newton's second law and understanding the dynamics of circular motion.

PREREQUISITES
  • Understanding of Newton's second law of motion
  • Knowledge of gravitational force calculations
  • Familiarity with circular motion dynamics
  • Basic trigonometry for resolving forces
NEXT STEPS
  • Study the application of Newton's second law in circular motion scenarios
  • Learn how to calculate gravitational force on an object
  • Explore examples of pendulum motion and tension calculations
  • Investigate the role of velocity in circular motion dynamics
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Students studying physics, particularly those focusing on mechanics and oscillating systems, as well as educators seeking to enhance their teaching of pendulum dynamics.

cstout
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Homework Statement


A pendulum is 0.8 m long and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob's speed is 1.8 m/s. What is the tension in the string at the bottom of the swing?

I don't even know how to get started on this problem, I think it has something to do with using the sin or cos but I can't find an example problem like this in my book.
 
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At the bottom of its swing, the only two factors putting forces on the bob must be the rope (tension) and gravity (weight). Thus, the two together must be the net force. What else is special about the motion of a pendulum bob? How is the velocity changing?
 

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