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Homework Help: 2 force practice problems

  1. Nov 18, 2009 #1
    an elevator weighing 2x10^5n supported by a cable what is the tension on the cable when accelerating up is 3m/s2 g=9.8 obviously


    an ice skater moves at 10 m/s and coasts to a halt in 100 meters on smooth ice what is the coefficient of friction on skates/ice

    i have tried many different ways and am not coming up with the answer i was given any help is greatly appreciated.
  2. jcsd
  3. Nov 18, 2009 #2
    It might be worthwhile to post some of the "many different ways" you've attempted, as per the template which you deleted when you posted.
  4. Nov 19, 2009 #3
    Question A-elevator)

    Forces pointing downwards: Weight of lift
    Forces pointing upwards: Tension force, ma(where m and a are mass and acceleration of lift respectivelly)

    Balance the two equations to find the missing link: The tension force.

    QuestionB-ice skater)

    Do exactly the same:

    From the data given (v and s) you can find the acceletarion(or rather deceleration), from this the coefficient of friction can be found easily.
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