Question

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

• A. $>0$
• B. $<0$
• C. zero
• D. maximum

Answer 1

Answer: (C)

zero

The tension in the string is along the radius circular path adopted by the bob; when the displacement of the bob is along the circumference of the path. Hence, again F and s are at ${90}^o$ and so, $W=0$.