A machine casing rests on a rough horizontal bench. Two horizontal pulls act on the casing: 42 N to the right and 18 N to the left. The casing remains stationary.
Explain the direction of the friction force on the casing and calculate its size.
93 exam-style questions on Edexcel GCSE Physics 9.1 Forces and vectors, covering 9.1.1 Interactions and types of force, 9.1.2 Vector and scalar quantities, and 9.1.3 Vector diagrams and free body diagrams. Each one has a worked solution and a mark scheme showing where the marks go.