The tongs are used to lift the 498 kg crate, whose center of mass is at G. The angle of member EH is 8 = 34 degrees. Determine the smallest coefficient of static friction required at the pivot blocks so that the crate can be lifted.

The tongs are used to lift the 498 kg crate, whose center of mass is at G. The angle of member EH is 8 = 34 degrees. Determine the smallest coefficient of static friction required at the pivot blocks so that the crate can be lifted.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.4P: The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical...

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Concept explainers

Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.

Question

The tongs are used to lift the 498 kg crate, whose center of mass is at G. The angle of member EH is 0 = 34 degrees. Determine the smallest coefficient of static friction required at the pivot
blocks so that the crate can be lifted.
Statics and Dynamics
R.C. Hibbeler
2010 Pearson Prentice Hall, Inc.
500 mm
500 mm
275 mm
E
A
300 mm
Ө
P
H
G-
F
B
D

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Step 2: equilbrium at point H

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Step 3: moment at point c

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Step 4: equilbrium equation of crate

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Step 5: Coefficient of friction calculation

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