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QLDEngineeringQuick questions
Unit 4: Machines and mechanisms
Quick questions on Levers and simple machines for QCE Engineering Unit 4
3short 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 is the principle of moments in a lever?Show answer
A lever is a rigid bar that turns about a pivot, the fulcrum. It balances when the turning effect of the effort equals the turning effect of the load:
What is the three classes of lever?Show answer
The class depends on the order of the fulcrum (F), load (L) and effort (E) along the bar:
What are the other simple machines?Show answer
Every simple machine changes a force at the cost of distance, leaving the work done the same (ignoring friction):
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