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Old Aug 21st 2018, 02:30 PM   #1
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The Coriolis effect, i understood this one to

if i must wait for approval of my reactions to other forummembers on my topics. a few days with my gravitation, time in space and more on the other topic. and now. i do not want to continue. i am also going to remove my account here.

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Old Aug 22nd 2018, 05:22 AM   #2
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The Coriolis effect is one of those things that is difficult to comprehend,
because it is not something we will normally personally experience on the size scales we can directly relate to.

The mathematics required is probably senior school level and relates to the difference between inertial and rotating reference frames.

Our normal perceptions are based on the assumption (built into the basic workings of our brains) that we are in an inertial reference system (the ground under our feet is fixed and stationary).
As soon as we put ourselves in a moving (accelerating or rotating) reference frame, things start happening that we would not expect.

Try this YouTube video clip:
<Coriolis Effect | National Geographic>

The world is rotating, so on a world sized scale we have a non-inertial (rotating) reference system, which brings the Coriolis Effect into play.
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Last edited by Woody; Aug 22nd 2018 at 05:25 AM.
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Old Aug 22nd 2018, 05:58 AM   #3
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This is the corioliseffect due to earths motion:

Please understand that the Coriolis effect is not due to the motion of the Earth alone.

It is due to the combined effect of the Earth's motion and the motion of some body relative to the surface of the Earth.

It is not experienced by a body that is stationary on the Earth's surface.
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Old Aug 22nd 2018, 03:39 PM   #4
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This is not that easy to gasp ....

When I saw this thread I searched it to remind me of what I should know...the videos I found were not helpful ....

The one from woody was good ... but expanding the roundabout illustration in that video, to someone sitting in Europe throwing a ball towards the Equator , It's not easy to see that as soon as the ball leaves the throwers hand , it's in a different frame of reference to the thrower.
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Old Aug 23rd 2018, 03:04 AM   #5
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You don't need to think of the ball and Earth as being in different frames to understand the Coriolis force.

Consider an observer sitting in stationary* space ship looking at the Earth's surface with a camera. A guy on the Earth's surface throws a ball due South. The observer uses the camera to observe the Earth and ball. The ball and Earth will move according to Newtonian mechanics and the trajectory of both objects, and their relative motion, can be fully explained without any additional fictitious forces.

The observer now takes a look at the position of the ball as a function of time and draws the trajectory on a 2D map of the Earths's surface (ignoring height). The trajectory of the ball does not look like a straight line on this map. It's because the Earth has a rotational acceleration, so the ball (and Earth) is in a non-inertial frame. If the coordinate system of the map is used to try and explain the motion of the ball, the trajectory can no longer be explained using standard Newtonian mechanics, but instead requires a modified mechanics that takes into account the rotating frame. The Coriolis force is a name for one of those modifications.

*Space ship is in the Solar system's frame of reference , which we will assume is inertial.

Last edited by benit13; Aug 23rd 2018 at 03:12 AM.
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