Terminal Velocity
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In fluid dynamics an object is moving at its terminal velocity if its speed is constant due to the restraining force exerted by the fluid through which it is moving. A free-falling object achieves its terminal velocity when the downward force of gravity (Fg) equals the upward force of drag (Fd). This causes the net force on the object to be zero, resulting in an acceleration of zero. As the object accelerates (usually downwards due to gravity), the drag force acting on the object increases, causing the acceleration to decrease. At a particular speed, the drag force produced will equal the object's weight (mg). At this point the object ceases to accelerate altogether and continues falling at a constant speed called terminal velocity (also called settling velocity). Terminal velocity varies directly with the ratio of weight to drag. More drag means a lower terminal velocity, while increased weight means a higher terminal velocity. An object moving downward with greater than terminal velocity (for example because it was affected by a downward force or it fell from a thinner part of the atmosphere or it changed shape) will slow until it reaches terminal velocity. From Wikipedia under the
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Q. When does terminal velocity take effect when all three start side-by-side at 10,000 feet? Which one is likely to be dead last and dead first? Explain why. Asked by kavekarst - Fri Feb 26 01:40:49 2010 - Other - Outdoor Recreation - 2 Answers - Comments A. A free-falling object achieves its terminal velocity when the downward force of gravity (Fg) equals the upward force of drag (Fd). This causes the net force on the object to be zero, resulting in an acceleration of zero. So, whichever object has most drag is dead last. Whichever object has least drag is dead first. Answered by Mr Striker - Fri Feb 26 03:23:59 2010 From Yahoo Answer Search: "terminal velocity" |
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