| Exam Board | Edexcel |
|---|---|
| Module | M3 (Mechanics 3) |
| Year | 2018 |
| Session | June |
| Marks | 4 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Hooke's law and elastic energy |
| Type | Elastic string equilibrium and statics |
| Difficulty | Moderate -0.8 This is a straightforward single-step equilibrium problem requiring only Hooke's law and weight balance. Students substitute known values into λx/l = mg and solve for l, making it easier than average with no problem-solving insight needed beyond standard formula application. |
| Spec | 6.02g Hooke's law: T = k*x or T = lambda*x/l |
\begin{enumerate}
\item A light elastic string of modulus of elasticity 29.4 N has one end attached to a fixed point $A$. A particle $P$ of mass 1.5 kg is attached to the other end of the string and $P$ hangs freely in equilibrium 0.5 m vertically below $A$. Find the natural length of the string.\\
\end{enumerate}
\hfill \mbox{\textit{Edexcel M3 2018 Q1 [4]}}