(a) In a certain lifting machine load of 100N is lifted by an effort of 8N and efficiency of the machine is 60%. Calculate the effort lost in friction and load lost in friction. (b) In a machine the effort required to lift certain load is 150N, when efficiency is 65%. Find the ideal effort.

(a) In a certain lifting machine load of 100N is lifted by an effort of 8N and efficiency of the machine is 60%. Calculate the effort lost in friction and load lost in friction. (b) In a machine the effort required to lift certain load is 150N, when efficiency is 65%. Find the ideal effort.

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 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

(a) In a certain lifting machine load of 100N is lifted by an effort of 8N and efficiency of the
machine is 60%. Calculate the effort lost in friction and load lost in friction.
(b) In a machine the effort required to lift certain load is 150N, when efficiency is 65%. Find
the ideal effort.

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