A pendulum bob swings from point A to point B along the circular arc indicated i

Question

A pendulum bob swings from point A to point B along the circular arc indicated in the figure (Figure 1). Part A Indicate whether the work done on the bob by gravity is positive, negative, or zero. work done on the bob by gravity is positive work done on the bob by gravity is negative work done on the bob by gravity is zero Part B Indicate whether the work done on the bob by the string is positive, negative, or zero. work done on the bob by the string is positive work done on the bob by the string is negative work done on the bob by the string is zero

Explanation / Answer

a. Work done is positive

b . Work done is ZERO ( because the string force(tension) is always perpendicular to the motion)

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