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Flip to reveal answersState the moment equation for a lever.
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All 4 Flashcards — Levers in use
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Question
State the moment equation for a lever.
Answer
Effort × effort arm = load × load arm, with both arms measured from the fulcrum.
Question
How do you check a lever calculation is the right way round?
Answer
A longer effort arm must give a smaller effort. On a first- or second-class lever the effort should be less than the load.
Question
Why is moving a wheelbarrow axle worth more than longer handles?
Answer
It shortens the load arm and lengthens the effort arm at the same time, so the ratio improves twice over.
Question
What bounds the mechanical advantage of a hand tool?
Answer
The user. A large MA needs a long effort arm and therefore a long hand movement, and handles that must open beyond an arm's reach are useless.
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Topic 7.3 hub
Mechanical systems applied
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