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Science: asteroid vs. hero physics
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<blockquote data-quote="Ovinomancer" data-source="post: 7493716" data-attributes="member: 16814"><p>How does the headwind exist for the flagpole? Let's look at a no wind situation. The flag-pole in relation to the city frame has no movement. There's no wind, not push, it's entirely stationary. Now, shift that to the car's frame. The flagpole now appears to be moving toward the car along with the city. The air is also moving towards the car at the same speed. The flagpole doesn't experience any forces from the headwind, as it's moving along with it and not opposing it in any way.</p><p></p><p>When you add the wind, the above doesn't change for the up/down direction. The wind blows sideways against the flagpole exactly the same way in both frames. You can even see this if you shift to the flagpole's frame (hint: it's the same as the city frame).</p><p></p><p>As for the crisp packet, what does it look like with no wind? The crisp packet, alongside the road, is still moving 'downward' at the speed of the frame. When the wind blows to the right, and pushes it in front of the car, the speed at which it's moving 'downward' <em>does not increase</em>. IE, the wind acts to push the packet to the right, but doesn't increase it's speed 'downward'. The packet is still moving with all of the air at the same speed 'downward' with or without the wind. It's speed laterally increases with the wind, but the wind adds no speed 'downward'.</p></blockquote><p></p>
[QUOTE="Ovinomancer, post: 7493716, member: 16814"] How does the headwind exist for the flagpole? Let's look at a no wind situation. The flag-pole in relation to the city frame has no movement. There's no wind, not push, it's entirely stationary. Now, shift that to the car's frame. The flagpole now appears to be moving toward the car along with the city. The air is also moving towards the car at the same speed. The flagpole doesn't experience any forces from the headwind, as it's moving along with it and not opposing it in any way. When you add the wind, the above doesn't change for the up/down direction. The wind blows sideways against the flagpole exactly the same way in both frames. You can even see this if you shift to the flagpole's frame (hint: it's the same as the city frame). As for the crisp packet, what does it look like with no wind? The crisp packet, alongside the road, is still moving 'downward' at the speed of the frame. When the wind blows to the right, and pushes it in front of the car, the speed at which it's moving 'downward' [I]does not increase[/I]. IE, the wind acts to push the packet to the right, but doesn't increase it's speed 'downward'. The packet is still moving with all of the air at the same speed 'downward' with or without the wind. It's speed laterally increases with the wind, but the wind adds no speed 'downward'. [/QUOTE]
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