User:Nihal vazhakkad

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In 1851 the scientist named foucault demonstrated the fact that no frame attached to the earth is inertial. In order to demonstrate it foucault took a bob of 28 kg, which is hanged in a wire of 70 metres length. The period of bob is about 17 seconds. The end of wire which is hanged in a rigid support have freedom to move any direction=====

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Consider if you started oscillating the pendulum now, if you look at the pendulum after few hours, you can see the pendulum oscillates in a plane which is different from the plane it oscillated initially. Practically, The oscillation will dead after sometime, so in order to overcome we must take big mass with long wire. Then we can observe that the plane of oscillation rotate and complete one rotation in 24 hours. This rotation is due to rotation of earth, while we take angular velocity of earth into to components we can see one of the component will be in the direction of rotation of plane of oscillation, which is the reason to the rotation of plane. =====

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In order to understand the idea, consider a person as earth, place a simple pendulum in his hand. tell the person to rotate in a constant angular velocity, oscillate the bob. We can see the bob oscillating in a constant plane while we look from outside. for the person who is rotating can see the plane of oscillation will see the is rotating. As the person who rotates above, we can say that according to we the people who rotating with the earth will see the plane of rotation of foucault's pendulum is rotating.=====