Which of the following describes an object with a non-zero resultant force acting on it?
A metal block sliding down a rough inclined plane at a constant speed.
A book resting on a horizontal table.
A rocket accelerating upward through the atmosphere.
A wooden toy boat floating stationary on the surface of a pond.
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.