Block \(A\), of mass \(0.2\) kg, lies at rest on a rough plane.
The plane is inclined at an angle \(\theta\) to the horizontal, such that \(\tan \theta = \frac{7}{24}\)
A light inextensible string is attached to \(A\) and runs parallel to the line of greatest slope until it passes over a smooth fixed pulley at the top of the slope.
The other end of this string is attached to particle \(B\), of mass \(2\) kg, which is held at rest so that the string is taut, as shown in the diagram below.
\includegraphics{figure_18}
- \(B\) is released from rest so that it begins to move vertically downwards with an acceleration of \(\frac{543}{625}\) g ms\(^{-2}\)
Show that the coefficient of friction between \(A\) and the surface of the inclined plane is \(0.17\)
[8 marks]
- In this question use \(g = 9.81\text{ ms}^{-2}\)
When \(A\) reaches a speed of \(0.5\text{ ms}^{-1}\) the string breaks.
- Find the distance travelled by \(A\) after the string breaks until first coming to rest.
[4 marks]
- State an assumption that could affect the validity of your answer to part (b)(i).
[1 mark]