A motor adjusts a ventilation flap using two interlocking gears. The driven gear is fixed to the flap shaft. Initially, the radius of the driven gear is twice the radius of the driving gear. The driven gear is replaced by one with the same radius as the driving gear. The force between the gear teeth is unchanged. Before and after the change, the motor turns in the same direction. Before the change, this direction of the motor opens the flap.
Which statement describes the effect of replacing the driven gear?
The moment on the flap shaft decreases, and the motor still opens the flap.
The moment on the flap shaft increases, and the motor still opens the flap.
The moment on the flap shaft decreases, and the motor now closes the flap.
The moment on the flap shaft is unchanged, and the motor now closes the flap.
124 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.