Four objects are in motion. Which object is experiencing a non-zero resultant force?
An object moving at a constant velocity in a straight line.
An object sliding down a slope at a constant speed in a straight path.
An object moving at a constant speed around a curved track.
An object falling through the air at terminal velocity.
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.