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#2
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![]() "Dave Doe" wrote in message . nz... In article , says... At the point where the tire contacts the ground, it's speed is zero. 180° away, at the top, it is moving forward at twice the speed of the car. Negative - yer forgetting centripetal force. ? Negative what? Talking about a point on the surface of the tire, not the wheel as a whole. Centripital force has nothing to do with the forward velocity of that point (how it travels in one axis). http://www.wordiq.com/definition/Centripetal -- Duncan |
#3
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In article ,
says... "Dave Doe" wrote in message . nz... In article , says... At the point where the tire contacts the ground, it's speed is zero. 180° away, at the top, it is moving forward at twice the speed of the car. Negative - yer forgetting centripetal force. ? Negative what? Talking about a point on the surface of the tire, not the wheel as a whole. Centripital force has nothing to do with the forward velocity of that point (how it travels in one axis). Are you talking about a round tire or not - are you then talking about a big long flat tire of say infinite length. Sorry bud, can't make the initial assumption that's been made - as it's on a tire, and yep, even that point, at that time - has the centripetal force. -- Duncan |
#4
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![]() "Dave Doe" wrote in message . nz... In article , says... "Dave Doe" wrote in message . nz... In article , says... At the point where the tire contacts the ground, it's speed is zero. 180° away, at the top, it is moving forward at twice the speed of the car. Negative - yer forgetting centripetal force. ? Negative what? Talking about a point on the surface of the tire, not the wheel as a whole. Centripital force has nothing to do with the forward velocity of that point (how it travels in one axis). Are you talking about a round tire or not What other kind of tire is there? .. Sorry bud, can't make the initial assumption that's been made - I'm not your bud,. And what assumption are you talking about? as it's on a tire, and yep, even that point, at that time - has the centripetal force. We aren't talking about the forces at work on the wheel or tire, we are talking about the forward velocity. I can see this concept is lost on you. -- Duncan |
#5
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In article ,
says... "Dave Doe" wrote in message . nz... In article , says... "Dave Doe" wrote in message . nz... In article , says... At the point where the tire contacts the ground, it's speed is zero. 180° away, at the top, it is moving forward at twice the speed of the car. Negative - yer forgetting centripetal force. ? Negative what? Talking about a point on the surface of the tire, not the wheel as a whole. Centripital force has nothing to do with the forward velocity of that point (how it travels in one axis). Are you talking about a round tire or not What other kind of tire is there? . Sorry bud, can't make the initial assumption that's been made - I'm not your bud,. And what assumption are you talking about? as it's on a tire, and yep, even that point, at that time - has the centripetal force. We aren't talking about the forces at work on the wheel or tire, we are talking about the forward velocity. I can see this concept is lost on you. There is no forward velocity - there *is* a change in angular momentum though. Do you not understand that concept? -- Duncan |
#6
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Dave Doe wrote:
We aren't talking about the forces at work on the wheel or tire, we are talking about the forward velocity. I can see this concept is lost on you. There is no forward velocity - there *is* a change in angular momentum though. Do you not understand that concept? I proudly profess to not understand that a point on the top of a tire does not move at twice the velocity of the axis of the wheel on which that tire is mounted. -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. |
#7
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I undertand that, for any one given point on a wheel, mounted on a vehicle,
traveling horizontally, more or less, there is a forward velocity (not constant) for exactly one half the time, and a rearward velocity (not constant) for exactly half the time, in relation the wheels' point of rotation. The average of this constantly changing velocity just happens to be the same as the forward speed of the vehicle. There is no forward velocity - there *is* a change in angular momentum though. Do you not understand that concept? -- Duncan |
#8
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Dave Doe wrote:
Try this for a brain scrambler. Think about a tire on your car, driving down the highway. At the point where the tire contacts the ground, it's speed is zero. 180° away, at the top, it is moving forward at twice the speed of the car. Negative - yer forgetting centripetal force. http://www.wordiq.com/definition/Centripetal Well, I'm impressed that you know of the existence of centripetal force. But in what possible way do you think it negates the comment about the speeds (relative to the ground) of points at the top and bottom of the tire on a moving car? -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. |
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