A-Level Maths: R6-03 Forces: Coefficient of Friction Example 2

[brokke]

Thank you! Your explanations are by far the clearest I've heard. Makes it all so much easier

[jordanw]

How do we know the particle isn't accelerating vertically? 2:40

[StreamerHighlightsHQ]

at what instance would you not use F in your diagrams? Here you used F (the frictional force) because of a rough horizontal surface, if it was smooth, would you not include F?

[roryhudson]

Why right at the end when you were working out the force why can’t you use F=ma??

[SadiqunhnabiChoudhury]

You said that F= meu x R when it is at the point of tilting. But why in this question have you used it when the particle is