(a(i))[2]
Show that the normal component of the contact force on the ring is $3.05\,\text{N}$, correct to $3$ significant figures.
(a(ii))[3]
Because the ring is in limiting equilibrium, find the coefficient of friction between the ring and the rod.
Mathematics 9709 · AS & A Level · Forces and equilibrium
Forces and equilibrium — practice question
A rough horizontal rod carries a small ring of mass $0.8\,\text{kg}$, and the ring is held in equilibrium while a force of magnitude $7\,\text{N}$ acts on it upwards at $45^\circ$ to the horizontal.