The observation of the bobs angling inward toward the center of the axis is due to Centripetal force.
Centripetal force refers to the force whose line of action is directed inwards for an object moving in a circular path.
The centripetal force is balanced by an oppositely directed forces called centrifugal force.
Centripetal force is responsible for keeping satellites in their orbit.
Therefore, the observation of the bobs angling inward toward the center of the axis is due to Centripetal force.
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