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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Coriolis effect
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<blockquote data-quote="Dave King" data-source="post: 29316" data-attributes="member: 3"><p>4mesh063</p><p></p><p> In reference to section 3.1 in the article</p><p></p><p> "3.1. I Feel The Earth Move Under My Feet: North/South Motion</p><p> Note first that all points on the Earth have the same rotational velocity, w (they go around once per day). Also, places at different latitudes have different linear speeds. A point near the equator may go around a thousand miles in an hour, while one near the North Pole could be moving only a few dozen miles in an hour.</p><p> Normally, objects in contact with the ground travel the same speed as the ground they stand on. As a result, the Coriolis force generally doesn't have a noticeable effect to people on the ground; the speed of the point you're standing on and the speed of the point you're stepping onto are too close for you to tell the difference. Or, looking back at the Coriolis Force equation above, if the velocity relative to the rotating frame (the Earth) is zero, so is the Coriolis force.</p><p> However, when an object moves north or south and is not firmly connected to the ground (air, artillery fire, etc), then it maintains its initial eastward speed as it moves. This is just an application of Newton's First Law. An object moving east continues going east at that speed (both direction and magnitude remain the same) until something exerts a force on it to change its velocity. Objects launched to the north from the equator retain the eastward component of velocity of other objects sitting at the equator. But if they travel far enough away from the equator, they will no longer be going east at the same speed as the ground beneath them.</p><p> The result is that an object traveling away from the equator will eventually be heading east faster than the ground below it and will seem to be forced east by some mysterious force. Objects traveling towards the equator will eventually be going more slowly than the ground beneath them and will seem to be forced west."</p><p></p><p> I do not see this as contrary to my statement(s) perhaps I explained poorly and/or there was an interpretion problem. As in my statement(s), both target and origin site have eastward but dissimilar speeds. If the speed of the target is less than the speed of the origin site ( a northerly shot in the northern hemisphere) the projectile will be deflected to the east and if the target has greater eastward speed than the origin site the projectile will be deflected to the west (a southerly shot in the northern hemishpere). Whether the varying shot deflection is eastward or westward it's always to the right for Coriolis in the northern hemisphere.</p></blockquote><p></p>
[QUOTE="Dave King, post: 29316, member: 3"] 4mesh063 In reference to section 3.1 in the article "3.1. I Feel The Earth Move Under My Feet: North/South Motion Note first that all points on the Earth have the same rotational velocity, w (they go around once per day). Also, places at different latitudes have different linear speeds. A point near the equator may go around a thousand miles in an hour, while one near the North Pole could be moving only a few dozen miles in an hour. Normally, objects in contact with the ground travel the same speed as the ground they stand on. As a result, the Coriolis force generally doesn't have a noticeable effect to people on the ground; the speed of the point you're standing on and the speed of the point you're stepping onto are too close for you to tell the difference. Or, looking back at the Coriolis Force equation above, if the velocity relative to the rotating frame (the Earth) is zero, so is the Coriolis force. However, when an object moves north or south and is not firmly connected to the ground (air, artillery fire, etc), then it maintains its initial eastward speed as it moves. This is just an application of Newton's First Law. An object moving east continues going east at that speed (both direction and magnitude remain the same) until something exerts a force on it to change its velocity. Objects launched to the north from the equator retain the eastward component of velocity of other objects sitting at the equator. But if they travel far enough away from the equator, they will no longer be going east at the same speed as the ground beneath them. The result is that an object traveling away from the equator will eventually be heading east faster than the ground below it and will seem to be forced east by some mysterious force. Objects traveling towards the equator will eventually be going more slowly than the ground beneath them and will seem to be forced west." I do not see this as contrary to my statement(s) perhaps I explained poorly and/or there was an interpretion problem. As in my statement(s), both target and origin site have eastward but dissimilar speeds. If the speed of the target is less than the speed of the origin site ( a northerly shot in the northern hemisphere) the projectile will be deflected to the east and if the target has greater eastward speed than the origin site the projectile will be deflected to the west (a southerly shot in the northern hemishpere). Whether the varying shot deflection is eastward or westward it's always to the right for Coriolis in the northern hemisphere. [/QUOTE]
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