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Question
Fig 3.17 below shows a lever in use.
(a) To which class of lever does it belong?
(b) If FA = 80 cm, AB = 20 cm, find its mechanical advantage.
(c) Calculate the value of E.
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Solution
(a) This is a class II lever.
(b) Given: FA=80 cm, AB = 20 cm, BF= FA+AB=100cm
Mechanical advantage M.A = `"๐ต๐น"/"๐ด๐น"`= `100/80` = 1.25
(c) Effort (E) = `"๐ฟ๐๐๐ (๐ฟ)"/"๐.๐ด"` = `5 /1.25` = 4 ๐พ๐๐
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The diagram shows the use of a lever.
- State the principle of moments as applied to the above lever.
- Which class of lever is this? Give an example of this class of lever.
- If FA = 100 cm, AB = 90 cm, calculate the minimum effort required to lift the load.
State the types (or kinds) of lever, and give two examples of each kind.
