Final answer:
The period of a pendulum is influenced by the length of the string and the acceleration due to gravity. Forces like weight and tension in the string play a role in the motion of the pendulum.
Explanation:
The two factors that affect the period of a pendulum are length of string and acceleration due to gravity. The period of a simple pendulum is solely determined by these two factors and is independent of other variables like mass or amplitude.
When considering the forces acting on the pendulum bob, it experiences the weight of the bob (mg) due to gravity and the tension in the string (T).
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