Question

Why should the amplitude be small foe a simple pendulum experiment?

Answer 1

Answer:

The Explanation describes why that is true for a simple pendulum.

Explanation:

You did not say what was oscillating. I will answer for the case where it is a simple pendulum that is oscillating. If it is a pendulum, amplitude must be small because the "time period does not depend on amplitude" rule applies to pendulums only if it is exhibiting simple harmonic motion.

Simple harmonic motion of a physical system requires that the force restoring the object (bob) to the equilibrium position must be proportional to the displacement from the equilibrium position.

Answer 2

The simple pendulum is associated with the restoring force.

• We can say that the force acting on the body until it reaches its original position.
• The formula of simple pendulum is F=k·x.
• Where x is the displacement we can simplify the formula by writing as F=kxsinФ
• As the Ф will change it will made huge impact on the force acting on the body.
• As they are both directly proportional to each other.
• The angle displaced, that change the amplitude also.
• Therefore, simple pendulum will always have the small angle.