Which of the following moving objects has a non-zero resultant force acting on it?
A swimmer swimming in a straight line across a pool at constant speed
A satellite orbiting the Earth in a circular path at constant speed
A skydiver falling vertically at terminal velocity
A crate sliding down a straight ramp at constant speed
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.