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[quote][i]Originally posted by Joe[/i] [quote][i]Originally posted by Paul_J[/i] no it doesn't. Brads thing doesn't say forces are equal. It says speeds are equal. Just because the belt is going 100 mph, it doesn't mean it's Holding the plane there. As its not a force against the plane. It's a force against the wheels which are turning, not pushing against the plane. They key thing is in equilibrium's is Equal forces. (not speeds) If I have a force going this way -------> <------- it must be equal to one going the other way to be equal. There's a force of say 26400 lb of thrust going ---------> from the plane. What force is there acting against it? there is a conveyer belt going <------------- the same speed, but that's not holding the plane back like a equal forced wind would - it's merely spinning the wheels which are under it. Possibly applying a slight force due to the friction within the wheel bearings. Thus if theres 16400 force -------> <-- and only say 1000 force resistance the forces are not equal and the plane will move down the conveyer belt until it reaches a high enough speed to take off. [/quote] This sums it up best to me, I have'nt read all the pages of this as i cant be arsed. And i originally thought that it would'nt take off. Reading this I realise it could. [/quote]
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