In which of the following situations is the resultant force on the object equal to zero?
An airplane accelerating down a runway for takeoff
A submarine descending vertically through water at a constant speed
A satellite orbiting the Earth at a constant speed
A cyclist braking as they approach a junction
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.