Easy -1.2 This is a straightforward equilibrium problem requiring only basic force analysis. Students need to recognize that P is in equilibrium (so tension equals its weight, 4g N) and apply vertical equilibrium to B (normal force = 5g - 4g = g N). It's simpler than average A-level questions as it involves no calculation complexity, just direct application of equilibrium conditions with clearly defined forces.
\includegraphics{figure_1}
A block \(B\) of mass 5 kg is attached to one end of a light inextensible string. A particle \(P\) of mass 4 kg is attached to other end of the string. The string passes over a smooth pulley. The system is in equilibrium with the string taut and its straight parts vertical. \(B\) is at rest on the ground (see diagram). State the tension in the string and find the force exerted on \(B\) by the ground. [3]
\includegraphics{figure_1}
A block $B$ of mass 5 kg is attached to one end of a light inextensible string. A particle $P$ of mass 4 kg is attached to other end of the string. The string passes over a smooth pulley. The system is in equilibrium with the string taut and its straight parts vertical. $B$ is at rest on the ground (see diagram). State the tension in the string and find the force exerted on $B$ by the ground. [3]
\hfill \mbox{\textit{CAIE M1 2009 Q1 [3]}}