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    I got the right answer for this question but I used F = μR whereas they used F≤μR

    So in the end I got F/R = μ , whereas they got F/R≤μ

    How do we determine whether to use the ''='' sign or the ''≤' sign ?
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    (Original post by sabre2th1)


    I got the right answer for this question but I used F = μR whereas they used F≤μR

    So in the end I got F/R = μ , whereas they got F/R≤μ

    How do we determine whether to use the ''='' sign or the ''≤' sign ?
    Only when there is motion can you be sure that friction is acting at it's maximum

    In this instance the wording of the question was a pointer to the sign
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    (Original post by TenOfThem)
    Only when there is motion can you be sure that friction is acting at it's maximum

    In this instance the wording of the question was a pointer to the sign
    Thanks. What part of the wording exactly indicated this?
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    (Original post by sabre2th1)
    Thanks. What part of the wording exactly indicated this?
    "the least possible value"

    you have found the least possible value anyway
 
 
 
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