Question

Can you fall faster than terminal velocity?


Answers (1)

by Ben Cracknell 13 years ago

Terminal velocity is defined as the point at which a falling body (a human one in this case) stops accelerating - i.e. It reaches a constant velocity in the direction of the earth.

Almost by definition then the answer is no, you can't fall faster than the fastest speed you fall at.

However, the generally accepted speed of terminal velocity for a human is between 115 and 125 miles an hour. If we use this figure it is definitely possible to travel faster than TV (Terminal Velocity, not television).

Terminal velocity is reached when the upward force exactly matches the downward force. In this case the upward force is air resistance which increases exponentially with speed, the downward force is, of course, the gravitational pull between two objects - or 'gravity', as non nerds call it.

To increase your speed (as you fall from the sky) the technique is to reduce drag by streamlining yourself. By offering the least frontal area and the smoothest surface much higher speeds can be achieved.

When the young James Kirk, jumps from the shuttle craft to sabotage the Romulan drill in the, frankly awesome, film 'Star Trek' he takes up an ideal pose, legs together, arms by his sides and head down. Although we don't know the density of Vulcan's atmosphere we can reasonably speculate that Kirk would have reached something in excess of 200mph (322kph), during his descent. As he would have done if he had tried the same stunt in Earth's atmosphere.

With the right breathing apparatus (and probably a space suit to be on the safe side), huge speeds could be reached by starting outside the earth's immediate atmosphere. In 'space' air resistance is practically non-existent and huge speeds could be reached as you plummeted toward Earth.

Speed skiers have been recorded well in excess of TV - Italian Simone Origone set the world record at 156.2 mph (251.4 km/h) - he used specialist equipment including a rubber suit and a helmet designed more for streamlining than for safety. Despite travelling well above TV it may be the argued that as he was travelling along as well as down his velocity toward the earth was not above TV, but that is just being picky.


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