**Question 6: Does the tension in the string of a swinging pendulum do any work? Explain.**
ANSWER
Work done by a force is given by

.

=FdcosΘ
Where

is the displacement of the body as a result of the applied force

and θ is the angle between

and

.
Now, the tension in the string acts upward and the velocity of the bob of the pendulum is always along the tangent to the path of the pendulum. So the angle between the tension

**T** and displacement

**d** is always 90°. Applying the above equation,

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