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Engineering Mechanics: Statics | 14th Edition | ISBN: 9780133918922 | Authors: Russell C. Hibbeler
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Chapter 8, Problem 8-38

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QUESTION:

The coefficient of static friction between the drum and brake bar is \(\mu_{\mathrm{s}}=0.4\). If the moment M = 35 N \(\cdot\) m, determine the smallest force P that needs to be applied to the brake bar in order to prevent the drum from rotating. Also determine the corresponding horizontal and vertical components of reaction at pin O. Neglect the weight and thickness of the brake bar. The drum has a mass of 25 kg.

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QUESTION:

The coefficient of static friction between the drum and brake bar is \(\mu_{\mathrm{s}}=0.4\). If the moment M = 35 N \(\cdot\) m, determine the smallest force P that needs to be applied to the brake bar in order to prevent the drum from rotating. Also determine the corresponding horizontal and vertical components of reaction at pin O. Neglect the weight and thickness of the brake bar. The drum has a mass of 25 kg.

ANSWER:

Step 1 of 5

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

First, we'll isolate and draw the free-body diagram of the drum.

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