Which of the following moving objects has a non-zero resultant force acting on it?
A lift moving vertically upwards at a constant speed
A skater gliding in a straight line at a constant speed
A satellite orbiting the Earth in a circular orbit at a constant speed
A hot-air balloon descending 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.