A bicycle is stationary. A rider pushes vertically downwards on a pedal with a force of 300 N.
The pedal crank and the chainwheel are fixed together and turn about the same axle.
The perpendicular distance from the centre of the axle to the line of action of the pedal force is 0.18 m. The pedal force produces a clockwise moment about the axle.
The chain exerts a force on the chainwheel. The perpendicular distance from the centre of the axle to the line of action of the chain force is 0.045 m. The chain force produces an anticlockwise moment about the axle.
The crank and chainwheel are balanced and do not rotate.
The moment of a force is given by the equation:
M=FdM = FdM=Fd
Calculate the moment produced by the force on the pedal.
State the relationship between the moment produced by the pedal force and the moment produced by the chain force.
Calculate the force exerted by the chain on the chainwheel.
The rider applies the same force when the perpendicular distance from the axle to the line of action of the force is smaller.
State what happens to the moment produced by the rider's force.
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.