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Mechanics
Quick questions on Moments: turning effect of forces, the principle of moments and equilibrium - Edexcel A-Level Maths
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are a strategy for beam problems?Show answer
Most beam questions follow the same routine. First, sketch the beam and mark every force with its distance from one end: the weight of a uniform beam acts at its midpoint, point loads act where they hang, and each support exerts an upward reaction. Second, take moments about one support so that its unknown reaction disappears, leaving a single equation for the other reaction. Third, resolve vertically (total up equals total down) to find the remaining reaction.
What are not resolving forces as well as taking moments?Show answer
Equilibrium needs both zero resultant force and zero total moment.
What is q1?Show answer
A force of N acts m from a pivot. Find its moment. [2 marks]
What is q2?Show answer
A light rod m long has a N weight m from end . Find the moment about . [2 marks]
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