Which moving object has a non-zero resultant force acting on it?
An elevator ascending vertically at a constant speed
A racecar traveling around a circular track at a constant speed
A submarine cruising horizontally in a straight line at a constant speed
A skydiver falling vertically at terminal velocity
183 exam-style questions on CIE IGCSE Physics 1.5.1a Forces, resultant force and motion. Each one has a worked solution and a mark scheme showing where the marks go.