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Foucault pendulum
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The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault, conceived as an experiment to demonstrate the Earth's rotation. If a long and heavy pendulum
Foucault's pendulum in the Panthéon, Paris
Foucault's pendulum in the Panthéon, Paris
A print of the Foucault Pendulum, 1895
A print of the Foucault Pendulum, 1895
Coriolis force
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In physics, the Coriolis force is a pseudo-force that acts on objects in motion within a frame of reference that rotates with respect to an inertial frame. In a reference frame with clockwise rotation
Foucault pendulum
…we consider a pendulum of length L and mass m, oscillating with small amplitudes. In a reference frame rotating with Earth at angular velocity Ω, the Coriolis force must be included. The equations of motion in the horizontal plane (x, y) are: where…
Image from Cursus seu Mundus Mathematicus (1674) of C.F.M. Dechales, showing how a cannonball should deflect to the right of its target on a rotating
Image from Cursus seu Mundus Mathematicus (1674) of C.F.M. Dechales, showing how a cannonball should deflect to the right of its target on a rotating Earth, because the rightward motion of the ball is faster than that of the tower.
Image from Cursus seu Mundus Mathematicus (1674) of C.F.M. Dechales, showing how a ball should fall from a tower on a rotating Earth. The ball is rele
Image from Cursus seu Mundus Mathematicus (1674) of C.F.M. Dechales, showing how a ball should fall from a tower on a rotating Earth. The ball is released from F. The top of the tower moves faster than its base, so while the ball falls, the base of the tower moves to I, but the ball, which has the eastward speed of the tower's top, outruns the tower's base and lands further to the east at L.
Due to the Coriolis force, low-pressure systems in the Northern Hemisphere, like Typhoon Nanmadol (left), rotate counterclockwise, and in the Southern
Due to the Coriolis force, low-pressure systems in the Northern Hemisphere, like Typhoon Nanmadol (left), rotate counterclockwise, and in the Southern Hemisphere, low-pressure systems like Cyclone Darian (right) rotate clockwise.
Cloud formations in a famous image of Earth from Apollo 17, makes similar circulation directly visible
Cloud formations in a famous image of Earth from Apollo 17, makes similar circulation directly visible