9. Work & Energy
Intro to Calculating Work
6:32 minutes
Problem 7.11
Textbook Question
Textbook Question(II) A lever such as that shown in Fig. 7–20 can be used to lift objects we might not otherwise be able to lift. Show that the ratio of output force, F_O, to input force, F_I , is related to the lengths ℓ_I and ℓ_O from the pivot by F_O / F_I = ℓ_I / ℓ_O . Ignore friction and the mass of the lever, and assume the work output equals the work input.
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