A uniform rod AB AB\,AB has length 8 m and mass 25 kg. It is supported by a pivot at PPP, where AP=3AP = 3AP=3 m. A vertical upward force of magnitude F F\,F N is applied at B B\,B so that the rod is horizontal and in equilibrium.
Use g=9.8 m s−2g = 9.8\text{ m s}^{-2}g=9.8 m s−2.
Find FFF.
State how the assumption that the rod is uniform has been used.
42 exam-style questions on WJEC A Level Maths 4.10 Moments (A-level only), covering 4.10.1 Moments (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.