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Science: asteroid vs. hero physics
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<blockquote data-quote="freyar" data-source="post: 7494365" data-attributes="member: 40227"><p>Of course the forces don't change, I haven't said that they do. But you said the "wind" doesn't change. The standard definition of wind is the (bulk flow) velocity of air as measured in a given frame. That's a velocity. It certainly changes. The issue which seems clear now after a long discussion is that you are using a non-standard definition of wind and are disagreeing with those of us who are using the standard definition.</p><p>The other confusion is that you seem to be changing what you're saying from post to post. In post 68 of this thread, you said that if the wind changes direction from frame to frame, the force would change, ignoring the fact that in the city's frame there is a component of the force (of air on the car) from the motion of the car through the air. Then in post 84, you put that component of force in both frames, but you rotated the "lateral" component of the force from the air (which is due to "wind" in both frames). In post 98, you are making a distinction between "headwind" and "crosswind," which is fine in that a car has a preferred orientation but isn't really relevant to overall definition of the wind. Wind velocity is a vector quantity, and how we choose axes to determine components of that vector doesn't change what the vector is. </p><p>Anyway, I think I'll stop talking about wind now. This isn't really getting anywhere.</p><p></p><p></p><p>Going from negative 90 degrees to positive 90 degrees covers the full 180 degrees from back to front. Or, if we can think about a sphere, it covers the full 180 degrees from the south pole to the north pole. (The 360 degrees around the equator don't really matter for what I've been talking about.)</p><p></p><p>I have to get going, so I will have to respond to the rest later. But my ENWorld time is usually a bit short, and I'd like to get back to monster conversions, so hopefully the plots I can post will be convincing.</p></blockquote><p></p>
[QUOTE="freyar, post: 7494365, member: 40227"] Of course the forces don't change, I haven't said that they do. But you said the "wind" doesn't change. The standard definition of wind is the (bulk flow) velocity of air as measured in a given frame. That's a velocity. It certainly changes. The issue which seems clear now after a long discussion is that you are using a non-standard definition of wind and are disagreeing with those of us who are using the standard definition. The other confusion is that you seem to be changing what you're saying from post to post. In post 68 of this thread, you said that if the wind changes direction from frame to frame, the force would change, ignoring the fact that in the city's frame there is a component of the force (of air on the car) from the motion of the car through the air. Then in post 84, you put that component of force in both frames, but you rotated the "lateral" component of the force from the air (which is due to "wind" in both frames). In post 98, you are making a distinction between "headwind" and "crosswind," which is fine in that a car has a preferred orientation but isn't really relevant to overall definition of the wind. Wind velocity is a vector quantity, and how we choose axes to determine components of that vector doesn't change what the vector is. Anyway, I think I'll stop talking about wind now. This isn't really getting anywhere. Going from negative 90 degrees to positive 90 degrees covers the full 180 degrees from back to front. Or, if we can think about a sphere, it covers the full 180 degrees from the south pole to the north pole. (The 360 degrees around the equator don't really matter for what I've been talking about.) I have to get going, so I will have to respond to the rest later. But my ENWorld time is usually a bit short, and I'd like to get back to monster conversions, so hopefully the plots I can post will be convincing. [/QUOTE]
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