A student uses a crowbar to lift a slab. The student moves the pivot nearer the slab and keeps the effort at the far end of the bar. Why is less effort needed?
The load arm increases while the effort arm increases.
The load arm decreases while the effort arm increases.
The load arm decreases while the effort arm decreases.
The load arm increases while the effort arm decreases.
102 exam-style questions on Edexcel GCSE Physics 9.2 Moments, covering 9.2.1 Rotational effects of forces and moments, 9.2.2 The principle of moments, and 9.2.3 Levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.