At the end of a ski run, a skier crashes into a barrier and is brought to a stop
ID: 1367792 • Letter: A
Question
At the end of a ski run, a skier crashes into a barrier and is brought to a stop. The skier is moving at speed v just before collision, and is brought to a stop over a time interval f. During the impact, the skier expenenced an average net force F from the barrier. If the time of impact to come to a full stop had been half as long (t / 2), with the same initial speed v, what would have been the average net force exerted on the skier during the collision? The average net force would have been... If the time of impact to come to a full stop had been the same (0, but the skier's initial speed had been twice as much (2v), what would have been the average net force exerted on the skier during the collision? The average net force would have been...Explanation / Answer
The average force will be ratio of change in mometnum to the time taken.
a)
If the velocity is kept constant, then the force experienced is inversly preportional to time, thus, if time is reduced by 2 then the force gets doubled and is 2F
b)
If the time is kept constant, then the force is directly preportional to velocity. Thus, if velocity is increased by 2, force also increases by the same factor. That is 2F
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