How much work is done by the string of a pendulum on its bob as it swings back and forth?(1 point) Responses a negative amount a negative amount negative when going up and positive when going down negative when going up and positive when going down zero zero a positive amount
The correct response is "zero". The work done by the string on the pendulum bob is zero because the force exerted by the string is always perpendicular to the displacement of the pendulum bob. Work is defined as the dot product of force and displacement, and since the angle between the force and displacement vectors is 90 degrees, the work done is zero.
