Two toy canal barges are joined together by a magnetic coupling. A student tries to separate the barges by pulling the rear barge with a piece of string.
Explain why a larger force is needed to separate the barges if the string is pulled at an angle to the line of the coupling, rather than directly along it.
19 exam-style questions on Edexcel GCSE Physics 9.1 Forces and vectors. Each one has a worked solution and a mark scheme showing where the marks go.