A box is pulled to the right along a floor with a force of 45 N. A friction force acts to the left. The resultant force on the box is 12 N to the right. What is the size of the friction force?
12 N
45 N
57 N
33 N
40 exam-style questions on AQA GCSE Physics 5.1 Forces and their interactions, covering 5.1.1 Scalar and vector quantities, 5.1.2 Contact and non-contact forces, 5.1.3 Gravity, and 5.1.4 Resultant forces. Each one has a worked solution and a mark scheme showing where the marks go.