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# M2 question F =uR watch

1. 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 ?
2. (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
3. (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?
4. (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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