A student is given a uniform metre rule, a knife-edge pivot, a 1.0 N weight and some thread.
The student is not given a balance or a newtonmeter.
Devise a method the student could use to determine the weight of the metre rule.
Your answer should include how the principle of moments is used to calculate the weight of the rule.
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.