Question
Asked Dec 16, 2019
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A clerk accelerates a crate of Oreo cookies, with a mass, m, down an aisle with a frictionless floor
by pulling on a rope attached to the box. The clerk pulls with a force, F, at an angle, 0(theta), with the
horizontal.

Would it be easier for the clerk to push the Oreos at a downward angle that pull at an upward angle when friction is present? Show supporting work.

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Expert Answer

Step 1

Consider the case when the box pulled at an upward angle and draw the free body diagram

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Fimg Fceso mg NE

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Step 2

Write the expression for net vertical force

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Fsine + N = mg N = mg – F sin e

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Step 3

Write the expression for n...

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F cos 0 – F; = ma F cos e – µN = ma Fcose - u(mg – F sin 0) = ma Fcose - Įmg + µµF sin 0

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