A rigid control arm turns about an axle at one end. A force is initially applied at right angles to the control arm at its free end. The same-sized force is then applied at the same point but is no longer at right angles to the control arm. What happens to the moment of the force about the axle?
It becomes zero, because a force must act at right angles to the control arm to produce a moment
It increases, because more of the force acts along the length of the control arm
It decreases, because applying the force obliquely reduces the distance from the axle to the free end
It decreases, because the perpendicular distance from the axle to the force's line of action is smaller
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.