For a rigid body to be in a state of static equilibrium, what conditions must the net external force and the net external torque satisfy?
Net external force is zero; net external torque is zero.
Net external force is zero; net external torque is non-zero.
Net external force is non-zero; net external torque is zero.
Net external force is non-zero; net external torque is non-zero.
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.