B. the force of tension is the other predominant force that affects the motion of a pendulum
The tension force is defined as the force that is transmitted through a rope, string or wire when pulled by forces acting from opposite sides.
The tension force in the string causes the bob to follow the circular path. At the bottom of the pendulum's swing the net force on the bob is the combination of the tension force in the string and the force due to gravity.
here , tension force is an upward force whereas gravitation force is a downward force , both are responsible for the movement of the pendulum
correct option B. the force of tension
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