Q151 / 200 · Manipal (MET) 2012 · Physics

When the bob of a simple pendulum swings, the work done by tension in the string is

  • A
    $\gt0$
  • B
    $ \lt 0$
  • Correct answer
    C
    zero
  • D
    maximum

Solution

Tension in the string is along the radius of circular path adopted by the bob; while displacement of the bob is along the circumference of the path. Hence, again $\mathbf{F}$ and $\mathbf{s}$ are at $90^{\circ}$ and so, $W=0$.

Hence, the correct answer is option: 'C'.

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