A-Level Maths: R4-17 Forces: Rough Inclined Plane Example 1

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Hey sir, so what if you're given kg instead of g(grams) ? Do you convert your numbers to grams?

deeceeeuum
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Hey Sir I think I'm starting A-Level Maths this September. I would like to know how the exams are laid out? For example, do we have 4 papers at the end of Year 13? One for C1, C2 and one for C2, C3 and one for Mechanics and one for Statistics? I can't seem to find this online :/ May you help me please?

siamsama
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Im on a question that days " A box of mass 0.03kg rests in equilibrium on a rough inclined plane at 30° to the horizontal"
"The box is just about to slip down the plane"
So ii) is the normal reaction just 0.03g × cos(30)
And iii) Find coeficient of friction.
Its the "about to slip down" that puts me off. Is there a force propelling forward?
Does acceleration =0 ?

lt