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A vertical string, suspended from a fixed point and having a small mass attached to...

Physics
WAEC 2010

A vertical string, suspended from a fixed point and having a small mass attached to the free end is set into oscillations. Which of the following statements about the system are correct? i. The potential energy of the mass is a minimum at the middle of the swing ii. Its kinetic energy is a maximum at the middle of the swing iii. The sum of the potential and kinetic energies is constant throughout the swing

  • A. i,ii and iii
  • B. i and ii only
  • C. ii and iii only
  • D. i and iii only
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Correct Answer: Option A
Explanation

Potential energy is minimum at the middle of the swing, where the mass is at its lowest point, Kinetic energy is maximum at the middle of the swing due to the highest speed. Lastly, the total mechanical energy remains constant throughout the swing, as energy converts between potential and kinetic forms.


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