Question: Consider a bob attached by a stringa simple pendulumthat swings to and fro. (a) Why does the tension force in the string not do work

Consider a bob attached by a string€”a simple pendulum€”that swings to and fro.

(a) Why does the tension force in the string not do work on the pendulum?

(b) Explain, however, why the force due to gravity on the pendulum at nearly every point does do work on the pendulum.

(c) Where is the single position of the pendulum where €œno work by gravity€ occurs?

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