Conservative Forces & Inclined Planes Video Lessons

Concept

Problem: A 61.0-kg skier starts from rest at the top of a ski slope of height 66.0 m .If frictional forces do −1.06×104 J of work on her as she descends, how fast is she going at the bottom of the slope?Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is 0.21. If the patch is of width 66.0 m and the average force of air resistance on the skier is 170 N , how fast is she going after crossing the patch?After crossing the patch of soft snow, the skier hits a snowdrift and penetrates a distance 2.6 m into it before coming to a stop. What is the average force exerted on her by the snowdrift as it stops her?

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Problem Details

A 61.0-kg skier starts from rest at the top of a ski slope of height 66.0 m .

If frictional forces do −1.06×104 J of work on her as she descends, how fast is she going at the bottom of the slope?

Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is 0.21. If the patch is of width 66.0 m and the average force of air resistance on the skier is 170 N , how fast is she going after crossing the patch?

After crossing the patch of soft snow, the skier hits a snowdrift and penetrates a distance 2.6 m into it before coming to a stop. What is the average force exerted on her by the snowdrift as it stops her?