Foucault Pendulum: Exploring the Coriolis Effect

In summary, the reason why the rotation of the Earth's structure does not affect the pendulum's plane of oscillation is because there are no forces acting on the pendulum to make it rotate. This is due to the fact that the force acting on the pendulum is always parallel to its plane of oscillation. Additionally, the support for the pendulum is unable to exert a significant torque on the system. It should also be noted that while the ball may rotate, the plane of motion remains unchanged.
  • #1
cepheid
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Can somebody explain to me why it doesn't matter that whatever structure from which a Foucault Pendulum is suspended is also rotating along with the Earth? How come the pendulum's plane of oscillation is not altered?

Wikipedia sort of has an answer, but to me it seems to amount to little more than a claim that it doesn't matter:

No forces act to make the plane of oscillation of the pendulum rotate - the plane contains the plumb line, so the force acting on the pendulum is parallel to the plane of oscillation at all times.
 
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  • #2
The pendulum's support can't put a very large torque on the swinging pendulum system, as the lever arm is almost zero.
 
  • #3
Note that the ball will rotate. It's just the plane of motion that doesn't rotate.
 

1. What is a Foucault Pendulum?

A Foucault Pendulum is a device that demonstrates the rotation of the Earth. It consists of a long pendulum suspended from a fixed point, with a weight at the end. As the pendulum swings back and forth, the Earth rotates beneath it, causing the pendulum to appear to change direction over time.

2. Who invented the Foucault Pendulum?

The Foucault Pendulum was invented by French physicist Léon Foucault in 1851. He was inspired by the work of French mathematician Jean-Bernard-Léon Foucault and built the first pendulum in his basement.

3. How does the Foucault Pendulum work?

The Foucault Pendulum works due to the principle of conservation of momentum. As the pendulum swings back and forth, the Earth rotates underneath it, causing the pendulum to appear to change direction. This is because the Earth's rotation is shifting the pendulum's plane of oscillation.

4. What is the purpose of the Foucault Pendulum?

The purpose of the Foucault Pendulum is to demonstrate the rotation of the Earth. It is also used as a teaching tool in physics and astronomy to illustrate concepts such as angular momentum and the Coriolis effect.

5. Can the Foucault Pendulum be used to determine one's location on Earth?

No, the Foucault Pendulum cannot be used to determine one's location on Earth. It only demonstrates the rotation of the Earth and is not precise enough to be used for navigation purposes.

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