11
QuizMultiple Select

Cumulative Exam — Cumulative exam

Question 11 • TX-Physics B

What are the conditions needed for an ideal pendulum? Check all that apply.

Answer
A
Gravitational force acts to pull the pendulum’s mass down.
B
The mass of the rod of the pendulum is evenly distributed along the rod.
C
The pivot on which the pendulum swings is frictionless.
D
The pendulum swings through its equilibrium position as a result of inertia.
E
Tension acts downward on the pendulum’s mass.

Explanation

An ideal pendulum’s mass is pulled downward by gravity, and it swings about a frictionless pivot. As it passes through its equilibrium position, inertia carries it onward before gravity pulls it back. The rod or string is treated as massless, so its mass does not need to be evenly distributed, and tension pulls toward the pivot rather than downward.

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