A locomotive of mass 80 000 kg80\,000\ \mathrm{kg}80000 kg travels forwards along a straight, level track. Its speed increases uniformly from 12 m s−112\ \mathrm{m\,s^{-1}}12 ms−1 to 18 m s−118\ \mathrm{m\,s^{-1}}18 ms−1 in 15 s. The engine exerts a driving force of 50 000 N50\,000\ \mathrm{N}50000 N forwards. Resistive forces act backwards.
Calculate the total resistive force acting on the locomotive.
103 exam-style questions on Edexcel GCSE Physics 2.3 Forces and Newton's laws, covering 2.3.1 Newton's first law, 2.3.2 Newton's second law, and 2.3.3 Weight and gravitational field strength. Each one has a worked solution and a mark scheme showing where the marks go.