Question
Asked Sep 30, 2019
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wofs
The unitorm bar of length L and werght w is kept in the
horizontal position. Determihe the smallest possible coefficient
of static friction betwecnbaw the bar and the inclincd
surfaccs.
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wofs The unitorm bar of length L and werght w is kept in the horizontal position. Determihe the smallest possible coefficient of static friction betwecnbaw the bar and the inclincd surfaccs.

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Expert Answer

Step 1

Consider the impending motion. (Left end moves down and right end moves up).

Three forces are acting on the bar and the forces intersecting at common point C as shown in free body diagram.

Sketch the free body diagram of the bar.

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C B 30° '60° SRB R S L/2 L/2

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Step 2

Refer Figure.

Find the angle θA using triangular rule.

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0, -90° + ф, — б0° — 30° + ф.

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Step 3

Find the angle θB using tri...

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0, %3 90° - ф — 30° — 60°- ф

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