A box slides down a rough sloping surface. Which statement describes the forces exerted by the surface on the box?
Friction acts down the slope; normal contact acts perpendicular to the slope.
Friction acts up the slope; normal contact acts perpendicular to the slope.
Friction acts up the slope; normal contact acts vertically upwards.
Friction acts down the slope; normal contact acts vertically upwards.
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.