A force is applied to a door so that the line of action of the force passes through the hinge. The door does not turn. Why does the door not turn?
The force is too small to overcome friction in the hinge
The perpendicular distance from the hinge to the force is zero
The force acts in the same direction as the weight of the door
The moment of the force is balanced by the weight of the door
40 exam-style questions on AQA GCSE Physics 5.4 Moments, levers and gears, covering 5.4 Moments, levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.