Moderate -0.8 This is a straightforward application of circular motion formula F = mω²r with all values directly given. Requires only substitution into a standard formula with no problem-solving, making it easier than average but not trivial since students must recognize the setup and recall the correct formula.
1 A horizontal circular disc rotates with constant angular speed \(9 \mathrm { rad } \mathrm { s } ^ { - 1 }\) about its centre \(O\). A particle of mass 0.05 kg is placed on the disc at a distance 0.4 m from \(O\). The particle moves with the disc and no sliding takes place. Calculate the magnitude of the resultant force exerted on the particle by the disc.
1 A horizontal circular disc rotates with constant angular speed $9 \mathrm { rad } \mathrm { s } ^ { - 1 }$ about its centre $O$. A particle of mass 0.05 kg is placed on the disc at a distance 0.4 m from $O$. The particle moves with the disc and no sliding takes place. Calculate the magnitude of the resultant force exerted on the particle by the disc.
\hfill \mbox{\textit{CAIE M2 2010 Q1 [3]}}