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Engineering and Tech / Engineering Mechanics: Statics 14 / Chapter 8 / Problem 8-37

Engineering Mechanics: Statics | 14th Edition | ISBN: 9780133918922 | Authors: Russell C. Hibbeler

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Solved: The coefficients of static and kinetic friction

Chapter 8, Problem 8-37

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QUESTION:

The coefficients of static and kinetic friction between the drum and brake bar are \(\mu_{s}=0.4 \text { and } \mu_{k}=0.3 \text {, }\), respectively. If M = 50 N \(\cdot\) m and P = 85 N, determine the horizontal and vertical components of reaction at the pin O. Neglect the weight and thickness of the brake. The drum has a mass of 25 kg.

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QUESTION:

The coefficients of static and kinetic friction between the drum and brake bar are \(\mu_{s}=0.4 \text { and } \mu_{k}=0.3 \text {, }\), respectively. If M = 50 N \(\cdot\) m and P = 85 N, determine the horizontal and vertical components of reaction at the pin O. Neglect the weight and thickness of the brake. The drum has a mass of 25 kg.

ANSWER:

Step 1 of 10

In order for the brake to hold the drum, friction force at B must be less than its maximum friction force

If this friction force can't stop the drum, friction force is equal:

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